2. There is a cell that divides once every minute, and one cell can be divided into nine at a time. 1999 minutes later, these cells were put into 7 test tubes on average, leaving () cells.
3. Use the symbol (a) to represent the integer part of A, such as (10.62)= 10, (15÷4)=3, then
( 120÷7)×(9.47- 1.83)=( )
4. □□□□□□□□□ +□□□ =199998, then the sum of the numbers in 10 □ is ().
5. The printing factory needs to print 270,000 copies of mathematical oral calculation books, 2855 copies a day in the day shift, and 290 copies more in the night shift than in the day shift. When completing the task, the number of copies printed in the day shift is less than that in the night shift.
6. On both sides of a 2000-meter-long highway, plant one poplar every 10 meter, and plant three maples every two poplars at the same distance. There are * * * kinds of maple trees on both sides of this highway.
8. Xiaoming rode on the back of an ox and drove four buffaloes across the river. These four cows need two minutes, three minutes, six minutes and eight minutes to cross the river respectively, and only two cows can be driven across the river at a time. Then it will take Xiao Ming at least () minutes to get all the cows across the river.
9. The Customs Building has twelve floors. Ping Li's father works on the tenth floor. One day, Ping Li went to see her father. It took her 40 seconds to walk from the first floor to the fifth floor. At this speed, it will take her at least () seconds to get to her father's office.
Xiaoling is 12 years old and her mother is 40 years old. When the mother's age is five times that of her daughter, the sum of mother and daughter's ages is () 1 1. Xiao Wei left home for an outing in Zhaobaoshan, 26 kilometers away, with a hound. His riding speed is 18 km per hour, and the running speed of hounds is twice as fast as riding. When the hounds run to the foot of Zhaobaoshan, if Xiao Wei hasn't arrived yet, they will immediately return and run to meet Xiao Wei, and then run to Zhaobaoshan after meeting Xiao Wei ... so they run back and forth until Xiao Wei arrives at Zhaobaoshan. At this time, the hound ran () kilometers.
12. There are a set of formulas: 1+ 1, 2+3, 3+5, 1+7, 2+9, 3+1,/kloc-0.
13. There are two trains. This bus is 200 meters long and travels 30 meters per second. This truck is 300 meters long and travels 20 meters per second. Two cars run side by side on parallel tracks in the same direction, and after () seconds, the passenger car overtakes the truck; If two cars drive in opposite directions, it takes () seconds from meeting to passing by.
14. There are 15 questions in the fourth grade math contest paper. Answer one question correctly and get 10; If you do a wrong question, deduct 4 points; No answer, 0 points. Li Chen got 88 points, but she didn't answer the question ().
15.4 (2) Class held the "June 1st" Gala, and the counselor and teacher took a sum of money to buy candy. If they buy mango 13kg, the difference is less than 4 yuan. If they bought toffee 15kg, there would be 2 yuan left. It is known that mango is 2 yuan a catty more expensive than toffee, so the counselor and teacher brought () yuan.
1+2+3=6,3+5+7= 15,5+8+ 1 1=24,7+ 1 1+ 15=33,( )。
2626÷202= 13,4242÷202=2 1,6868÷202=34,( )。
3、( 1+2+3+4+5+……2998)÷2999=( )。
4. The box is full of balls and squares with the same description. You can take out 5 balls and 3 squares at a time. After taking () times, there is no ball, leaving 10.
5. A number can be added, subtracted, multiplied and divided by itself. Its sum, difference, quotient and product are 12 1, and this number is ().
6. A pile of parts with 100. If there are four bags, there are two more, if there are seven bags, there are three more, if there are nine bags, there are five more. This pile of parts is ().
7. If it takes six times to saw a piece of wood into three sections, it takes () times to saw the piece of wood into six sections at the same speed.
8.a and B are both natural numbers, and a+b= 100. The maximum product of a and b can be (), and the minimum product can be ().
9. There are 500 peach and apricot trees in the orchard. The number of peach trees is twice that of apricot trees 16, and there are () peach trees.
10, Xiao Ming mistyped the dividend 16 1 as 188 when calculating division with remainder. The result quotient is 3 more than the original, but the remainder is exactly the same. The rest of the question is ().
1 1. Xiao Fang is two years older than Xiaozhen. Four years ago, their age was 18. This year, Xiao Fang () years old.
12, a rectangle can be cut into two squares, so the perimeters of the two squares are higher than the rectangle 16 cm. It turns out that the area of a rectangle is () square centimeters.
13, a math test, five people take a * * *, get 434 points, the highest score 100 points. Everyone else's scores are integers, so the fifth place scored the most ().
14, the sides of two squares in the right figure are 6 cm and 4 cm respectively, and the area of triangle ABC is () square cm.
15. There are several balls in four colors: red, yellow, blue and black. Everyone can choose two balls at will, so it is necessary for () people to choose to ensure that at least two people choose the same ball.
16, 20 rabbits can be exchanged for 2 sheep, 9 sheep can be exchanged for 3 pigs, 6 pigs can be exchanged for 2 cows, 12 cows can be exchanged for () sheep.
17. After the math contest, Party A, Party B and Party C guess their ranking among the three. A said, "I am not the first"; B said, "I am the last one"; C said, "I'm in front of A". Only A is right. So how do these three people's grades rank from high to low? ( )
Wang Ming went home from school. When he was 3 10 meters away from home, his sister came to him with the puppy. The speed of Wang Ming and his sister is 50 meters per minute, and the speed of the puppy is 200 meters per minute. After meeting Wang Ming, the puppy has been running back and forth between Wang Ming and his sister at the same speed. When the distance between Wang Ming and his sister was 10 meter, the puppy ran () meters.
19, Xiaoming wants to take out 60 cents from many coins and buy a pen with 2 yuan money. There are at most () different grips.
(3) On the clock face, at 6 o'clock sharp, the hour hand and the minute hand form an angle of () degrees.
(5) The clock strikes 4 at 4 o'clock, and 12 seconds ends. So it strikes 6 times at 6 o'clock and ends in _ _ _ seconds?
(6) Every floor of a building should take 16 steps, and there are 64 steps to Xiaoying's house, where Xiaoying lives.
(7) The number of A is 92, the number of B is 58, which is more than 7 times that of A, and the number of B is ()
(8) Find a pattern to fill in the blanks: 1, 3,7,13,21,(), 43, (), ...
199999+ 19998 + 1997+ 196+ 10
(26, 38, 44, 53, 62) One number is different from the other four numbers. Please search by ().
According to the old calendar, New Year's Day in 200 1 year is Friday, so New Year's Day in 2002 is a week ().
5. There are 87 black, white and red beads, and four black, three white and two red beads are worn together. Excuse me, the last one is () and the 58th one is ().
6. The dividend is 3320, the quotient is 150, the remainder is 20, and the divisor is ().
7. You have to take 16 steps on each floor, and take 64 steps to Xiaoying's house, where he lives.
8. The sum of two numbers is 6 16, and the last digit of a number is 0. If it is the same as another number without 0, the difference between the two numbers is ().
9. 1, 2, 3 and 4 are composed of four digits from small to large, and the number of 15 is ().
Second, the application problem
1, the sum of a, b and c is 1 160, a is half of b, b is twice of c, what are the numbers of a, b and c respectively?
2. The water in barrel A is four times that in barrel B. Take it out of barrel A 15kg and pour it into barrel B. The two barrels are equal. How many kilograms are there in two barrels of raw water?
3. Party A and Party B each have a few kilograms of oil, such as pouring the same amount of oil from barrel A to barrel B, and then pouring the same amount of oil from barrel B to barrel A. At this time, the two barrels of oil are exactly 36 kilograms. How many kilograms is there in a barrel of oil?
4. Pour the water into the empty bottle with a cup. Pour in 3 cups of water, and a bottle of * * * weighs 440 grams. If you pour 5 glasses of water, the bottle weighs 600 grams. How much does a glass of water weigh with this empty bottle?
5, a bundle of wires, the first time used more than half, the total length of 3 meters, the second time used more than half, leaving 5 meters, leaving 7 meters. How long is the wire?
6. The money of both parties is the same. If Party A gives Party B 30 yuan, Party B's money is five times that of Party A .. How much did A and B originally have?
7. Party A travels 67 kilometers every day and Party B travels 55 kilometers every day. Today, he also went from the East Village to the West Village. However, after 30 kilometers, Party A returned to the East Village for some reason and immediately rushed to the West Village. If they all go to the West Village, ask the distance between the two villages is () kilometers.
1. When two numbers are divided, the quotient is 8 10. If the divisor remains the same, the dividend is reduced by 10 times, and the quotient is ().
The circumference of a square is 56 cm and the area is () square cm.
10. Chicken and rabbit 120. A chicken has 60 fewer legs than a rabbit. There are () chickens and () rabbits.
Xiaohong walked along a rectangular garden 70 meters long and 20 meters wide. Xiaohong left (), and half of the garden area was ().
1. There are three boxes of pears, * * * weighs 209 Jin, box A is less than box B 16 Jin, box B is less than box C 15 Jin. How many Jin of pears are there in boxes A, B and C? (6 points)
The perimeter of a square is equal to the perimeter of a rectangle, and the width of the rectangle is 6 meters, which is equivalent to half the length. Find the area of this square. (6 points)
3. Fisheries Research Institute released new fish species, with 3,500 small fish per hectare. How many small fish should be put in a fish pond 600 meters long and 450 meters wide? (6 points)
4. A train runs at the same speed for 4 hours in the morning and 6 hours in the afternoon, which is less in the morning than in the afternoon 136 km. It takes 14 hours 15 minutes for the train to travel from Xi 'an to Beijing at this speed. How far is it from Xi 'an to Beijing?
1. There is a watch, one hour is fast 10 minutes. This watch says 8 o'clock. When this table is 1 1: 30, the correct table should be () point.
2. Draw four straight lines on a rectangular piece of paper, which can be divided into () parts at most.
3. The problem of a number multiplied by 5 and then multiplied by 4 is miscalculated as a number multiplied by 5 and then multiplied by 4 to get 34. The correct answer should be ().
4. Party A, Party B and Party C practiced shooting, * * * 150 shot, and 64 missed. It is known that A and Otsuichi threw 46 pitches, while B and C threw 70 pitches. B scored () times.
Uncle Wang bought a box of beer from a small shop, with 24 bottles. Small shop regulations: after drinking wine, every three empty bottles can be exchanged for a bottle of beer. He can drink a bottle of beer. ⑵ 19999+ 1999+ 199+ 19+9
6. Party A and Party B each have 30 yuan money. After Party A gave Party B 5 yuan money, Party A had more 2 yuan money than Party B. That armor used to have () yuan.
7. Write 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 as two multi-digits to minimize the difference between these two multi-digits. The smallest difference is ().
8. Xiaoming is playing "Apple Man" game. The game provides three different faces, four different bodies and two different pairs of feet. Ask Xiao Ming that a * * * can form () different "Apple people".
9. There are 500 peaches and apricots in the orchard. The number of peaches is less than that of apricots 1 16. The number of peaches is ()
10, two cousins, the elder brother and the younger brother are 30 years old and 12 years old respectively. After the elder brother is twice as old as the younger brother ().
1 1. There is a rectangle with a circumference of 88 cm, which consists of three squares. Find the area of this rectangle is () square meters.
There are 50 students in Class One, Grade Four. 12. In the math exam, the average score of the top ten students is 8 points higher than that of the whole class, and the average score of the rest students is () points lower than that of the whole class.
13. If the sum of numbers A, B, C and D is 96, and A +3= B-3 = C× 3 = D ÷3, then D = ().
14. There are 25 seats in the first row of the cinema. In the future, each row will have 2 more seats than the front row, and the last row will have 75 seats. This cinema has () seats.
15. A ship travels from place A to place B, with a speed of15km when it goes there and10km when it comes back. It is found that the average speed of the ship going back and forth is () kilometers.
16. Two cars, A and B, went from the same place to another place at the same time. The speed of A is 50 kilometers per hour, and the speed of B is 75 kilometers per hour. As a result, A arrived two hours later than B, and the distance between the two places was () kilometers.
17, two iron wires with the same length, the first one is cut off 10 cm. Cut 26 cm from the second root. The remaining iron wire, the first one is five times that of the second one. It turns out that every wire is () cm long.
18, there are two kinds of cars for students' spring outing. Each large car can take 65 people and each medium car can take 26 people. There are 338 students and teachers, so everyone should have a seat.
A, and there are no extra seats in the car, large cars need (), medium-sized cars need ().
Party A and Party B walk in opposite directions along the railway at the same speed. It takes 8 seconds for a train to pass through A, 20 seconds for a train to meet B, and 7 seconds for a train to pass through B. Then it will take () seconds for A and B to meet from the moment when the train meets B.
1, known as □× χ = 32 □□× χ = 2 □ = () ○ = ()
3. Use two zeros and two fives to form a maximum four-digit number and a minimum four-digit number. Divide the largest four digits by the smallest four digits. The quotient is () and the remainder is (). 2、999+999×999=( )
4. When two numbers are divided, the quotient is 2 1. If the dividend increases by 10 times and the divisor decreases by 10 times, the quotient becomes ().
Three years ago, my mother was six times older than my daughter. This year, my mother is 33 years old and my daughter ().
6. Party A, Party B and Party C each have some story books. After Party A gave Party B three story books and Party B gave Party C five story books, the number of story books of three people was the same, and Party B had () more than Party C. ..
7. The results of the mid-term exam were announced. Xiao Wang's grades are better than Xiao Li and Xiao Zhang's, and Xiao Zhang's grades are better than Xiao Li's, but worse than Xiao Wu's, () is the worst.
8. 240 exercise books, each with 18 sheets of paper. If you order 6 books at the time of binding, you can have more () books.
9. The number of A is 136, which is twice as much as that of B. The number of 4, C is 3 less than that of B, and the number of C is ().
10, with () rectangles on the right.
1 1. Fold a rope in half and then in half, and then cut it in the middle. This rope was cut into () sections.
12, Xiaogang climbed a 48km hillside and walked for 6 hours. It took 4 hours to go down the hill, and the average speed up and down the hill was ().
13. Someone went to the bank to withdraw money. For the first time, he took more than half of his deposit in 5 yuan, and for the second time, he took the remaining half. 10 yuan. At this time, there is 125 yuan left in the passbook, and his original deposit was () yuan.
14. There are 42 students in class one, 28 students participate in math interest groups, 14 students participate in Chinese interest groups, 10 students participate in both interest groups, and some () students do not participate in both interest groups.
15. Pour water into an empty bottle with a cup. If you pour 3 cups of water, the bottle weighs 440 grams. If you pour nearly 5 cups of water, the bottle weighs 600 grams. This empty bottle weighs 20 grams.
16. Xiaohua Mall keeps 20 fish at home. From now on, he plans to catch/kloc-0 fish every day. If he eats three fish every day, these fish can be fed to Xiaohua Mall for () days.
17, a factory processes a batch of parts, originally planned to produce 40 pieces a day, but actually produced 50 pieces a day. Results The task was completed three days ahead of schedule, and () pieces were originally planned to be produced.
18, the experimental primary school held a summer camp, with 9 students in each group, and then regrouped, with 12 students in each group, which was 3 groups less than the original, and () students participated in the summer camp.
19, Chinese New Year. The students plan to make their own greeting cards. On a rectangular white paper with a length of 7 decimeters and a width of 5 decimeters, at most () square greeting cards with a side length of 2 decimeters can be cut out, and the area of the remaining white paper is () square decimeters.
In the 20.60m race, when A reaches the finish line, B is still10m away from the finish line, and C is still 20m away from the finish line. If the speeds of B and C remain the same, when B reaches the finish line, C is still () meters away from the finish line.