2. The length of a steel pipe is10m. Cut off 7/ 10 for the first time, and cut off the remaining 1/3 for the second time. How many meters are left?
3. After 2/3 of the expressway is completed, it is16.5km away from the midpoint. What is the total length of this highway?
4. The master and the apprentice made a batch of parts together, and the apprentice made 2/7 of the total, 2 1 less than the master. How many parts are there in this batch?
5. There is a batch of chemical fertilizers in the warehouse, and 2/5 of the total amount was taken out for the first time, and less than 1/3 of the total amount was taken out for the second time. At this time, there are 24 bags left in the warehouse. How many bags are taken out twice?
6. The distance between Party A and Party B is 1 152km. A bus and a truck leave from two places at the same time. Trucks run 72 kilometers per hour, 2/7 faster than buses. How many hours did it take for two cars to meet?
7. A coat is more expensive than a pair of trousers 160 yuan, in which the price of trousers is 3/5 of that of a coat. How much is a pair of trousers?
8. There are 60 black rabbits in the feeding group, and there are more white rabbits than black rabbits 1/5. How many white rabbits are there?
9. The school wants to dig an 80-meter-long sewer. 1/4 was dug on the first day, and 1/2 was dug on the second day. How many meters have you dug in two days? How many meters are left?
10. The circumference of a rectangle is 24 cm, and the length-width ratio is 2: 1. How many square centimeters is the area of this rectangle?
1 1. The sum of the sides of a cuboid is 96 cm, and the ratio of length, width and height is 3: 2:1. What is the volume of this cuboid?
12. The total length of a cuboid is 96 cm, the height is 4 cm, and the aspect ratio is 3 ∶2. What is the volume of this cuboid?
13. There are 42 computer interest groups in a school. The ratio of male to female is 4: 3. How many boys are there?
14. There are two baskets of fruits, and the first basket weighs 32kg. After taking out 20% from the second basket, the weight ratio of the two baskets of fruits is 4:3. How many kilograms were there in the original two baskets of fruit?
15. Make a 600g bean paste bun, and the ratio of flour, red beans and sugar is 3:2: 1. How many grams of flour, red beans and sugar do you need?
16, Xiao Ming reads story books. On the first day, he read 1/9 of the book, and the next day, he read 24 pages. The ratio of pages read in two days to remaining pages is 1: 4. How many pages are there in this book?
17, the ratio of the three internal angles of a triangle is 2:3:4. What are the degrees of these three internal angles?
18. The output value of a chemical fertilizer plant this year increased by 20% compared with last year, with an increase of 5 million yuan. What is the market value this year?
19. The fruit company stored a batch of apples. After selling 30% of the apples, we shipped 160 boxes, which was more than the original apples110. How many boxes of apples are there?
20. The original price of a commodity is 20% less than the current price, and the current price is 1028 yuan. What is the original price?
2 1. Interest earned from education savings is tax-free. Dad saved Xiao Xiao's education savings for three years, with an annual interest rate of 5.40%. Upon maturity, * * * received the principal and interest of 22,646 yuan. What is the principal of the education savings fund that Dad gave Xiao Xiaocun?
22. The clothing store bought two pieces of clothes at the same time, each of which earned 120 yuan, but one of them earned 20% and the other accompanied 20%. Did the two clothes sold by the clothing store make money or lose money?
23. The father is 43 years old and the daughter is 1 1 year old. A few years ago, my daughter was 20% older than my father.
24. 20% of less than 2/5 tons is () tons, and 30% of () tons is 60 tons.
25, a 200-page book, read 20%, and left () pages unread. 40% of the number A is equal to 50% of the number B. The number A is 120 and the number B is ().
26. A factory used 5,400 tons of water in the second half of April, saving 20% compared with the first half. How many tons of water were used in the first half of the year?
27. Zhang Ping has 500 yuan money and plans to deposit it in the bank for two years. There are two deposit methods. One is to save it for two years, with an annual interest rate of 2.43%. One is to save it for one year with an annual interest rate of 2.25%. When the first year expires, take out the principal and after-tax interest and deposit it for another year. Which method can I choose to get more after-tax interest?
28. Xiaoli's mother saved 5,000 yuan in the bank for a year, with an annual interest rate of 2.25%. When withdrawing money, the bank withheld and remitted 20% interest tax. How much interest tax was paid at maturity?
29, the flour yield of a wheat is 85%, to grind out 13.6 tons of flour, you need _ _ _ _ tons of such wheat.
30. There is a ring. The circumference of the inner circle is 3 1.4 cm, the circumference of the outer circle is 62.8 cm, and what is the width of the ring?
First, let's go! Believe that smart you are the best!
The first thing we have to do is to fill in the blanks.
1, a circle has countless radii, and they are all the same.
2. Fill in the numbers according to the law: 100%, 0.9, 0.80% (percentage), 10/7 (fraction), 0.6 (decimal), (fraction).
3. The circumference of a circle is () times the diameter.
4, less than 20% of 300 is ()
5. The minute hand of the wall clock is 5cm long, and its tip is () cm.
Class 6.6 (1) has 29 boys and 2 girls, accounting for ()% of the class.
7.A is 40, B is 80, and A is ()% of B.
8. The radius of the circle is enlarged by 2 times, and the area is enlarged by () times.
9. If the number A is 5 and the number B is 4, then the number A is ()% more than the number B. ..
10. Dissolve 5g of salt in 95g of water, accounting for ()% of the salt water.
1 1, rectangular, square and circular are enclosed by iron wires with the same length, and the enclosed () area is the largest.
Grade 6 12 class (1) had an attendance rate of 98% on a certain day. There were 50 students in * * * class, and there were () people absent from class that day.
Scoring reviewer
Second, I will choose: think twice before you act, and be careful of the trap. I believe you can do it!
Fill in the brackets with the serial number of the correct answer. )
1 and 100 are greater than 80 ().
20% B.25% C.80%
2. Laugh and be naughty and go home together after school. After walking for a while, I smiled and said to Naughty: I have walked 40% of the whole journey, and Naughty said: I have walked 90% of the whole journey. () Go home first.
A. Smile B. Naughty C. Uncertainty
3. The original price of a refrigerator is 2 100, and now it is 30% off. What's the current price? The formula is ()
a 2 100÷70% B 2 100×70% C 2 100×( 1-70%)
4. Draw a circle with a circumference of 18.84 cm, and the distance between the two feet of the compass should be () cm.
A 3 B 6 C 9 D 12
5. The water consumption in September is 8% less than that in August, and the water consumption in September is that in August ().
A 108% B 92% C 8% D cannot be judged.
Scoring reviewer
Third, please judge right and wrong.
(The "√" in brackets is correct, and the "×" in brackets is wrong. )
1, in the same circle, the diameter is twice the radius. ( )
2. Put 10g salt into 10g water, and the weight of salt accounts for 10% of the weight of brine. ( )
If A is 20% bigger than B, B must be 20% smaller than A.. ( )
4. The areas of two circles with equal perimeters must also be equal. ( )
5. A commodity is 15% off, which means that this commodity is discounted by 15%. ( )
Scoring reviewer
Connect the questions: (Connect the questions with the corresponding formulas with lines. )
There are 25 boys and 20 girls in Class One, Grade Six.
(1) How many times are there boys than girls? 20÷25
② What percentage of girls are boys? (25-20)÷20
③ What percentage of boys are more than girls? 25÷20
(4) What percentage of girls are less than boys? (25-20)÷(25+20)
⑤ What percentage of girls are less than boys in the class? (25-20)÷25
Verb (abbreviation of verb) practical application. Let's experience the application of mathematics in life. Be careful, don't make mistakes. Read the questions several times before you do them.
1. There are 80 boys and 60 girls in grade six in Le Tong school. How many percent are girls less than boys?
2. The electricity consumption of schools in Le Tong 10 was 1200 kWh, which was 20% lower than that in September. What is the electricity consumption of schools in Le Tong in September?
3. The circumference of a circle is 12.56 meters, so what is the radius of this circle? How many square meters is the area?
4. A commodity is sold at a 20% discount, which is cheaper than 84 yuan. What is the original price?
Xiaoxiao deposited 20,000 yuan in the bank for three years, with an annual interest rate of 2.70%. After paying 20% interest income tax, how much principal and interest should the bank pay Xiaoxiao?
6. A village planted 2400 trees last year, 20% less than before, and what percentage more than last year?
Responder: Flame A-I 2009-7-3011:53.
He was curious to report O(∩_∩)O~. Well, he is a good classmate (this guy seems to like watching armored soldiers talk ~ ~ ~). All my questions are thoughtful, and one can reach three ordinary math problems, so do it carefully ~ ~ ~
The school organizes students to participate in tree planting activities. Forty people from Class Six (1) went to plant 120 trees. After planting trees for 2 hours, the ratio of completed trees to remaining trees is 4: 1. At this rate, how many hours will it take to complete the task of planting trees?
An express train and a local train go from A to B at the same time. It is known that it takes 10 hour for the express train to complete the whole journey, and 15 hour for the local train. The express train will return immediately after arriving at B. How many hours will it take to catch the local train? (super difficult topic)
Li Ming's father went to the mall and bought a color TV at the purchase price. The manager said to him, "if I give you a 10% discount on the selling price, I can make a profit 100 yuan." If I give you a 20% discount, I will lose 100 yuan. I won't lose money if I give you a 15% discount. " Can you help Li Ming's father figure out the purchase price of this TV set?
Let A△B represent 4 times of A minus 3 times of B, that is, A△B=4A-3B, such as 3△2=4×3-3×2= 12-6=6, and it is known that X△(5△2)=46, and the value of X is found. ..
Fifty students attended the party. The first girl present shook hands with all the boys, the second girl present only one boy did not shake hands, and the third girl present only two boys did not shake hands, and so on. The last girl present shook hands with seven boys and asked how many boys there were among the 50 students.
It is known that line segment AB=200 cm, and point M is the end point of line segment AB; Point C is the point on the extension line of line segment AB, AC=3BC, point D is the point on the extension line of line segment BA, and AD= half AB.
(1) Find the length of BC line.
(2) Find the length of the line segment DC
(3) Question m is the midpoint of those line segments.
The first question. fill up a vacancy
1. 1: (ratio in mathematics) The simplest integer ratio is ().
Second, the quotient of the number A divided by the number B is 6.5, and the ratio of the number A to the number B is ().
Three, two squares, the big square is 6cm long and the small square is 2cm long. The ratio of side length of a big square to a small square (), the ratio of perimeter () and the ratio of area ().
The second problem is judgment.
Is the simplest integer ratio10: 2 5 right or wrong?
The third problem is to solve practical problems.
The first little question. The school bought a number of desks and chairs, and the actual investment was 2/9 less than planned. Find the ratio between the planned investment amount and the actual savings amount.
The second little question. Wang Bin has read 2 1 page. The ratio of pages read by wild rats to pages unread is 3: 5. How many books are there in this book?
The ratio of 18k gold to other rare metals is 3: 1. There is a 20g 18k gold jewelry. How many grams of gold does it contain?
Answer:
The first question. fill up a vacancy
1. 1: (ratio in mathematics) The simplest integer ratio is (2: 3).
2. The quotient of number A divided by number B is 6.5, and the ratio of number A to number B is (2: 13).
Three, two squares, the big square is 6cm long and the small square is 2cm long. The side length ratio, perimeter ratio and area ratio of a big square to a small square are (3: 1), (3: 1) and (9: 1), respectively.
The second problem is judgment.
Is the simplest integer ratio10: 2 5 right or wrong? wrong
The third problem is to solve practical problems.
The first little question. The school bought a number of desks and chairs, and the actual investment was 2/9 less than planned. Find the ratio between the planned investment amount and the actual savings amount.
2:9
The second little question. Wang Bin has read 2 1 page. The ratio of pages read by wild rats to pages unread is 3: 5. How many books are there in this book?
Page 35
The ratio of 18k gold to other rare metals is 3: 1. There is a 20g 18k gold jewelry. How many grams of gold does it contain?
Mom and Xiaohong folded the same amount of paper cranes for dad who was rescued in the disaster area. Mom got 1, Xiaohong got 120, and Xiaohong got 75%. Mom folded them all. How much did mom discount?
The ratio of mother to Xiaohong is 4: 3.
120*4/3= 160.
160/ 1/3=480
Answer: Mom got a 480 discount.