How far is he from A after (1) 1 hour?
(2) If A and B are 50 meters apart, can he reach B? If yes, how long will it take? If not, please explain why.
First, please draw a line chart according to the description of each question below:
1, two cars, A and B, leave from A and B relatively simultaneously. Car A can travel 55 kilometers per hour, and car B can travel 60 kilometers per hour. Three hours later, the two cars are still 40 kilometers apart. How many kilometers is it between A and B?
The distance between a and b is 250km. Car A can run 55 kilometers per hour. It takes 2 hours to leave from A, and the B train can run 60 kilometers per hour. How many hours does it take for B car to meet A car?
Second, only column types are not calculated:
1, the total length of Shanghai-Nanjing Expressway is 274.08 kilometers. Two cars left Shanghai and Nanjing at the same time, 1.2 hours later they met. One car travels 1 18.4 kilometers per hour, and how many kilometers does the other car travel per hour?
Xiao Xin's home and school are 290 meters apart. One day, he walked 50 meters to school and found that he forgot to wear his school uniform. He put it on at home and then went to school. So how many meters did he walk from home to school?
3. Group A and Group B completed 150 machine parts. It is known that group A can make 24 parts in 0/2 minute, and group B can make 3 parts per minute. How many minutes did it take Group A to complete this batch of parts?
4. The distance between Party A and Party B is 480 kilometers, and the bus and truck leave the two places at the same time and drive in opposite directions. Four hours later, the distance between the two cars is still 80 kilometers. It is known that trucks travel 53 kilometers per hour. How many kilometers does this bus travel per hour?
Two cars, A and B, walked in opposite directions from two places 450 kilometers apart and met five hours later. It is known that the speed of car A is 0.5 times that of 65438+ car B, so how many kilometers can car B travel per hour?
Third, the application problems:
1, the distance between Party A and Party B is 480km. A car travels from A to B at a speed of 52 kilometers per hour. After driving to 3 12 km, you meet a car coming from Party B. If the car coming from Party B is driving at a speed of 42 km/h, calculate whether the two cars leave at the same time.
Passenger ships and cargo ships leave from two ports 450 kilometers apart at the same time. The passenger and cargo speed is 25 kilometers per hour, and the cargo ship speed is 30 kilometers per hour. /kloc-How many kilometers are the two rounds apart after 0/0 hour?
On a straight highway, Xiaoming and Xiaogang ride bicycles from A and B, which are 400 meters apart. Xiaoming walks 240 meters per minute, and Xiaogang walks 160 meters per minute. If you keep going at this speed. Will they meet? If you think you won't meet, please give reasons; If you think you will meet, ask to meet in a few minutes.
4. A bus from A to B, with a speed of 75 kilometers per hour, is expected to arrive in 3 hours. After driving 1 hour, the machine broke down and was repaired on site for 20 minutes. How many kilometers should I accelerate every hour to arrive on time without delay?
5. Two cars, A and B, drive in opposite directions from two places at the same time. Car A travels 45 kilometers per hour and car B travels 42 kilometers per hour. Two cars meet at the midpoint 12km. How many hours passed after the two cars left at the same time? How many kilometers are the two places apart?
6. Cars A and B leave from A and B which are 360 kilometers apart at the same time. It takes 5 hours for bus A to arrive at B, and 6 hours for bus B to arrive at A. When bus A arrives at B, how many kilometers is bus B from A?
7. Two trains leave from Station A and bilibili at the same time, with a 6-hour express and a 9-hour local train. Two hours later, the distance between the two trains is160km. How many kilometers is the distance between Station A and bilibili?
Respondent: q 2925552- probation period level 1 1-5 20:03.
Why do you want to know? You can buy books to do it! ~~
Responder: Looking Back at Tears-Magic Apprentice Level 1 1-5 20:34
1+ 1=?
Respondent: coolman 32 1- first grade of probation 1-5 2 1: 19.
xxz
Respondent: ★→→→-probation level 1 1-7 20: 16.
There is a heretical uphill road and a flat road from A to B. If the uphill road keeps 3 kilometers per hour, the flat road keeps 4 kilometers per hour and the downhill road keeps 5 kilometers per hour, then it takes 54 points from A to B and 42 points from B to A. What is the total distance from A to B?
Respondent: Sun's probationary period level 1 1-7 20:22
A plus B =300 B plus C = 1000 A plus B-C =?
Respondent: Xu Zhengtian 159- first grade of probation 1-8 18:02.
First, please draw a line chart according to the description of each question below:
1, two cars, A and B, leave from A and B relatively simultaneously. Car A can travel 55 kilometers per hour, and car B can travel 60 kilometers per hour. Three hours later, the two cars are still 40 kilometers apart. How many kilometers is it between A and B?
Interviewee: 7 1777 14877 wml- novice level 2 1-8 20:07.
It's absolutely difficult, but it's not difficult for the people you meet. Those who can't do it can't graze with a shepherd boy named Zhi Hui. When an old man approached, Xiao Zhi asked, "How many sheep do we have?" . The old man pointed to wisdom and said, "You and (wisdom) 10 are half." He also pointed to wisdom and said, "You and (wisdom) 5 are equal." Two children said, "Exactly. Ask wisdom, what dimensions does wisdom have?
Respondents: QQ 745564392- Trainee Wizard Level 2 1-8 2 1: 12.
Equation: X+Y-8Y+XY-9X=48.
I've been thinking for a long time ~ ~ ~ ~ ~ ~ ~ ~
Respondent: YF23 new-probationary period level 11-110: 28.
First of all, Fuwa Huanhuan sent us a set of topics, including 20 logos (two for each topic). Go put it away.
1, No.2 in row 5 of the Olympic Stadium can be represented by (5,2), followed by (7,4). Fine soft hair or feathers.
The arithmetic square root of 2.8 1 is _ _ _ _, = _ _ _ _ _.
3. The positive integer solution of inequality -4x ≥- 12 is.
4. In order to make it meaningful, the value range of X is _ _ _ _ _ _ _ _.
5. In △ABC, it is known that both sides A = 3 and B = 4, so the value range of the third side C is _ _ _ _ _ _ _ _.
6. If one side of an isosceles triangle is equal to 5 and the other side is equal to 8, then the circumference is _ _ _ _ _ _ _.
7. As shown in the figure, please add a condition to make AD‖BC.
8. If the cube root of a number is itself, then the number is.
9. The coordinates of the point P (-2, 1) moving up by 2 units are.
10. Observe the following equation, =2, =3, =4. Please write a list containing n (n >); The equation of 2) represents the general formula of the above laws:.
Students, I am Fuwa Jingjing. What's the answer to Huanhuan's question? I'm in trouble. The teacher gave me some multiple-choice questions. I didn't meet the teacher's requirements, and I couldn't get the logo. It's all up to you (***20 yuan, two yuan for each question).
1 1. The Olympic Games need a polygonal tile to lay a seamless floor. The purchased tile shape cannot be ().
A, equilateral triangle; B, square; C, regular octagon; Regular hexagon
12, with the following statement:
(1) irrational number is an inexhaustible number; (2) Irrational numbers are infinitely cyclic decimals;
(3) Irrational numbers include positive irrational numbers, zero irrational numbers and negative irrational numbers; (4) Irrational numbers can be represented by points on the number axis. The correct statement is ()
A. 1
13, in,, 3. 14, 2+,-,0, 1.22666 …, the number of irrational numbers is ().
A.3 B. 4 C. 5 D.6
14. Known
a . a+5 & gt； b+5？ B.3a>。 3b； C.-5a >-5b？ d . >；
15. Let "●", ▲ "and ■" represent three different objects and weigh them twice with a balance, as shown in Figure 2. Then, these three objects are arranged as () in descending order of mass.
A.■●▲ B. ■▲● C. ▲●■ D. ▲■●
16, if the solution set of the inequality group is-1≤x≤3, the correct representation in the figure is ().
17, given that point M(3a-9, 1-a) is in the third quadrant, and its coordinates are integers, then a= ().
A. 1
18, Beijing will hold an Olympic commemorative stamp exhibition. If each person has three stamps, there will be 24 more. If there are four stamps per person, there will be 26 less stamps. The number of stamps on display is: ()
a、 174 B、 178 C、 168 D、 164
19. In order to welcome the Olympic Games and protect the ecological environment, a county in our province responded to the national call of "returning farmland to forests" and changed part of cultivated land into forest land. After the change, the forestland area and cultivated land area * * * are 180 square kilometers, and the cultivated land area is 25% of the forestland area. In order to find out how many square kilometers the forestland area and cultivated land area are after the change. Let the changed cultivated land area be x square kilometers and the forestland area be y square kilometers. According to the meaning of the question, list the following four equations, of which the correct one is ().
A B C D
20. In an Olympic knowledge contest, there are 20 multiple-choice questions. The grading standard is: 1 5 points for the question, 2 points for the wrong 1 question, no points or points for not answering the question. Fuwa Jingjing has two unresolved issues. Answer at least a few questions correctly, and the total score will not be less than 60 points. Then Jingjing's at least correct number of questions is ().
A.7 Questions B.8, C.9 and D. 10
Third, Fuwa Beibei ran over and said to everyone, "Hurry up, the Olympic Committee is recruiting scorekeepers, scorekeepers. Let's go and have a look. " When they got there, it turned out that they were qualified. You must answer the following questions correctly. Can you do it? (**20 sheets, 5 sheets for each question)
(2 1)
(22) Solving inequality 2x- 1
(23)
(24).
Yingying brought a drawing of the Olympic venues. It is known that in △ABC, AD and AE are bisectors of the height and angle of △ABC respectively. If ∠ B = 30 and ∠ C = 50, can you help the master worker solve the following problems?
(1) Find the degree of ∠DAE. (5 pieces)
(2) What is the relationship between ∠ DAE and ∠C-∠B? (No proof required) (3 pieces)
26. Fuwa Yingying is going to buy a kitten and a puppy toy. Instead of telling Yingying the price of toys, the store gave her the following information to calculate the price of each kitten and puppy together with Yingying! (8 pieces)
A * * * to 70 yuan;
A * * * wants 50 yuan.
27.BOCOG will choose a company from A and B to print some Olympic commemorative books. A company puts forward that the design fee and processing fee are * * 1500 yuan, and each book is charged with material fee. 5 yuan: Company B proposed that each book should be charged with materials and processing fees ***8 yuan, but not design fees. The number of albums to be produced is X, which is charged by Company A..
(1) Please write down the relationship between the album number X for making the commemorative album and the charge (RMB) of Company A; (3 pieces)
(2) Please write down the relationship between the album number X for making the commemorative album and the expenses (yuan) of Company B; (3 pieces)
(3) If you go to Company A and Company B to order commemorative books, which company do you think has the best price? Please write down the analysis reasons. (6 pieces)
Finally, five Fuwa took us to visit the "Bird's Nest" of the National Stadium. VIP tickets are 20% off for group tickets with more than 20 people (including 20 people) in 30 yuan. Our party has 18 people (including Fuwa). When the captain Huanhuan prepared change at the ticket office to buy 18 tickets, Jingjing, who loves thinking, stopped Huanhuan.
(1) Please calculate, is Jingjing's proposal correct? Is it really "wasteful"? (4 pieces)
(2) When the number of people is less than 20, how many people should go to the "Bird's Nest"? Is it more economical to buy 20 tickets? (8 pieces)
Dear classmate: How many badges have you collected? If you can collect more than 85 photos, you may receive Fuwa's signed photos. Work hard!
References:
www.pep.com
Respondent: 82387078- novice level 31-1121:48.
1. Fill in the blanks (3 points for each small question, 30 points for * * *)
1. Fill in the following numbers in the corresponding set as needed.
Positive integer set: {...}
Negative score set: {...}
Non-negative integer set: {...}
2. The lowest temperature in a certain area is℃, and the highest temperature is℃. The temperature difference in this area is _ _ _ _ _ _ _ _ _ _ _℃
3. The number of 3 unit lengths of the axis from the origin is _ _ _ _ _ _ _ _ _.
4. If the reciprocal of a number is the smallest positive integer, then this number is _ _ _ _ _ _ _ _ _.
5. If yes, then _ _ _ _ _ _ _ 0.
6.80 1562 1 The approximate number accurate to thousands is _ _ _ _ _ _ _.
7. There are _ _ _ _ _ _ _ significant digits; Accurate to _ _ _ _ _ _ _ _ _ _ _ _.
8. And, _ _ _ _ _ _ _ _ _.
9. In 200 1 year, a company exported $65,438+0,800, which was $30,000 more than the four times of 1.99 1 year. Let the company's export volume at 1.99 1 be USD x million, and the equation can be listed as _ _ _ _ _ _.
10. Given:,, the number of units is _ _ _ _ _ _ _ _.
2. Multiple choice questions (3 points for each question, *** 18 points)
1 1. The following is the () of a linear equation with one variable.
A.B.
C.D.
12. The number whose square equals itself is ()
A.0 B. C. 0 and D. 0 and 1
13. The deformation process in the following equation is correct ().
A. from, from
B. by, by
C. from, from
D. from, from
14. If, then the correct one in the following formula is ().
A.B.
Conditions are not enough to judge.
15. The following calculation result is positive, which is ()
A.B.
C.D.
16. If a root is known, the value of m is ().
A. 8th century BC
3. Calculation questions (4 points for each small question, 20 points for * * *)
17.
18.
19.
20.
2 1.
4. Solve the following equation (4 points for each small question, *** 12 points)
22.
23.
24.
5. Answer (6 points for 25 questions and 27 questions, 5 points for 26 questions; *** 17)
25. Xiaoming must arrive at the school 1000 meters away from home before 7:50 every morning. One day, Xiao Ming set out at a speed of 80m/ min. Five minutes later, Xiaoming's father found that he had forgotten to bring his Chinese book. So, dad immediately chased Xiao Ming at the speed of 180m/ min and caught up with him on the way.
(1) How long did it take Dad to catch up with Xiaoming?
(2) How far is it from school when catching up with Xiao Ming?
26. Shop A first bought 10 pieces of a certain commodity at the price of 15 yuan, and then went to Shop B to buy 40 pieces of the same commodity at the price of 12.5 yuan. If the store sells these goods, it will make a profit of 65,438+02%. What should the price of this commodity be?
27. The basic electricity price for urban residents is 0.4 yuan per kWh. If the monthly electricity consumption exceeds one kWh, the excess will be charged at 70% of the basic electricity price.
(1) A household used 84 degrees of electricity in May, and * * * paid 30.72 yuan for electricity, so find A.
(2) If the household's electricity bill in June is 0.36 yuan per kilowatt-hour, how many kilowatt-hours will be used in June? How much electricity should I pay?
6. Solve the problem (3 points for this small problem)
28. Let's look at the problem first: the Nanjing-Shanghai railway is 300 kilometers long. In order to meet the requirements of economic development in two provinces and cities, the speed of passenger cars increased by 40 kilometers per hour, which shortened the time from Nanjing to Shanghai by 1.5 hours, thus finding the original speed and current speed of the train.
If the original speed of the bus is x kilometers per hour, the equation listed according to the meaning of the question is:
If the speed of the bus is x kilometers per hour, the equation listed according to the meaning of the question is:
Please refer to the above application problem and fill in a similar application problem (no need to solve). This application problem should meet the following requirements:
(1) does not change the form of the equation; (2) change the actual background and data
Respondent: as 5254792008- new to Jianghu level 2 1- 13 10:57.
1. An oil importing country imported 5% less oil this year than the previous year. Due to the rise in oil prices, the price of oil purchased this year increased by 1.4% compared with the previous year. What percentage has the oil price increased this year?
Last year, the depositor's deposit in a savings office was 46 million yuan. Compared with last year, this year's time deposits increased by 20% and demand deposits decreased by 25%, but the total deposits increased by 65,438+05%. What are the time deposits and current deposits this year?
At 5 o'clock sharp, the angle between the hour hand and the minute hand is-
4. The price of a coat after the cost price rises by 50% is 105 yuan, and the cost price of this coat is-yuan.
5. Party A and Party B practice running on the 400m track. It is known that the speed ratio of Party A and Party B is 14: 13. If Party A and Party B start in the opposite direction at a distance of 22 meters and meet for the first time after 28 seconds, it is said that if Party A and Party B compete 10000 meters, Party A can compete.
6. It is known that the speed of a boat in still water is 7.5km per hour and the current speed is 2.5km per hour. If the distance between a and c is 10km, find the distance between a and b.
7. At present, it takes 70 cubic decimeters of wood to produce a batch of tables, and each table consists of a desktop and four legs. As we all know, it takes 6 cubic decimeters of wood to make the table top and 2 cubic decimeters of wood to make the table legs. Q: How much wood does it take to produce a desktop?
8. Grade seven students go to the auditorium for a meeting. If five people sit on each bench, there will be less 10 benches. If six people sit on each bench, there will be two benches left. What are the number of students and benches?
9. There are three people, A, B and C. A walks 60 meters per minute, B walks 67.5 meters per minute and C walks 75 meters per minute. If Party A and Party B are in the East Village and Party C is in the West Village, they will walk in opposite directions from both villages at the same time. After meeting Party B, Party C will continue to walk for 65,438+0 minutes to meet Party A ... How many meters are the two villages apart?
10. One day, Xiao Ming and his father bought 58 200 yuan * * coins from the bank. After careful cleaning, Xiao Ming found that 20 of them were 1 yuan, 7 were 10 yuan, and the rest were from 2 yuan and 5 yuan. How many bills are there?
1 1. Students of a certain grade go out to visit. If there are 45 people in each car, 15 people have no seats. If there are 60 people in each car, one car will be vacant. How many cars are there? How many students are there?
12. Students in a class took part in earth-moving activities. Some people carried the earth, while others picked it up, so as to know how many people were in the class, including 59 earth baskets and 36 porters.
13 the environmental protection team of a school collects waste batteries. On the first day, we collected 4 batteries 1 and 5 batteries/5, with a total weight of 460 grams. The next day, there were two knots on 1, and the total weight of the unmarked three knots was 240 grams. How many grams do the first and fifth knots weigh?
14. It is known that a railway bridge is 1000 meters long and a train passes through it. It is measured that it takes * * * one minute from the time the train starts to get on the bridge to the time when the car body crosses the bridge, and the time for the whole train to get on the bridge completely is 40 seconds. What is the speed and length of the train?
15.a and B are 42km apart. If they ride in the opposite direction and meet two hours later, if they walk in phase at the same time, it will take B 14 hours to catch up with A. What is the average speed of A and B?
16. It takes 3 hours for a ship to travel 36 kilometers downstream and 24 kilometers upstream. What is the speed of the ship in still water and current?
17. Someone applied for two kinds of loans from Party A and Party B, * * * 1.36 million yuan, with annual interest of168,400 yuan. The interest rate of loan A is 12%, and that of loan B is 13%. How much are these two kinds of loans?
18. A school organized class A and class B students to participate in the voluntary labor of "beautifying the campus". If Class A works for 2 hours and Class B works for 3 hours, it just completes half of all the work; If Class A does 2 hours before other tasks, and the rest of the work is done by Class B alone, then the time spent by Class B is just more than the time spent by Class A to complete all the work alone 1 hour. A How many hours does it take a person to finish this job? B how many hours does it take?
19. When the market is in short supply, the price of drugs operated by a pharmacy increases by 100%, and the price department investigates and deducts it to limit the price increase to 10% of the original price. What is the current price reduction of this drug?
20. When does the minute hand and the hour hand on the clock coincide between nine and ten o'clock? When is the minute hand and the hour hand on the clock at right angles? When is the minute hand and the hour hand on the clock at right angles?
2 1 (super problem): Make a formula x with 123456789? = Numbers cannot be duplicated.
①4*(-3)? +6
=
②(-3/4)*(-8+2/3- 1/3)
=
③(-2)? - 13÷(- 1/2)
=
④0-2? ÷(-4)? - 1/8
=
⑤(-2)? *0.5-(- 1.6)? ÷(-2)?
=
⑥-3/2*[(-2/3)? -2]
=
⑨ 16÷(-2)? -(- 1/8)*(-4)
=