1, the quotient of a divided by b is 1.4, and the simplest integer ratio of a to b is ().

2. The radius of the small circle is 65438+ 0/2 of the radius of the big circle, the perimeter ratio of the small circle to the big circle is (), and the area ratio is ().

3. If 1/2 of A is equal to1/3 of B (A is not equal to 0), then A: B = ().

4. Because A× 3/4 = B× 4/5, A ∶ B = ().

5. The ratio of number A to number B is 4: 5, and the ratio of number B to number C is 2: 3. What is the ratio of the number A to the number B?

6. A building 15 floor, * * * is 42 meters high, and Xiaoping lives on the sixth floor. How high is the floor of Xiaoping's house from the ground?

7.20kg: 0.2t The simplest integer ratio is (), and the ratio is ().

8. The minute hand of the wall clock is 20 cm long. After 30 minutes, what is the distance traveled by the tip of the minute hand? In 45 minutes?

9. Divide a circle with a diameter of 10cm into 32 equal parts and cut it into an approximate rectangle. What is the area of this rectangle?

10, ① The diameter of the circular roundabout is 50m, and there is a circular flower bed with a diameter of10m in the middle.

Other places are lawns. What is the area of the lawn?

(2) Outside the circular flower bed with a diameter of 4m, a circular gravel road with a width of 2m is paved. this

How many square meters is the area of Crossroads?

1 1、 ( ) =20÷( )=8:( )=0.8=( )%

/kloc-class 0/2 and class 6 (2) were absent from class, and 48 were in class. What is the attendance rate? If the attendance rate of physical education class in this class was 94%, how many people in this class were absent from physical education class?

13. A rope is 8 meters long. Subtract 1/2 for the first time, leaving () meters. Subtract 1/2 meters for the second time, leaving () meters.

14, an MP3, the current price of 330 yuan, is lower than last year 170 yuan, by what percentage?

15. When water turns into ice, the volume will increase by11/,so when it turns into water, the volume will decrease by ()%.

16, simple calculation. ①87× 10. 1 ② 0.99 × 99

17, and the side length ratio of two cubes is 3 ∶ 2; The ratio of the surface areas of large and small cubes is ();

The volume ratio of large and small cubes is ().

18, (1) an electrical appliance, first price 10%, then price 10%. The current price is compared with the original price ().

(2) For an electrical appliance, the price shall be increased by 10% first, and then reduced by 10%. The current price is compared with the original price ().

A, the current price is higher than B, the original price is higher than C, and the same price is higher than D, which is incomparable.

19, ① Cut a rope into two sections, the first section accounts for 2/3 of the total length and the second section is 2/3 meters long. How long is it?

(2) Two ropes with the same length, the first one is cut off by 2/3, and the second one is cut off by 2/3 meters. Which one has been cut off more?

A, Article 1 Article B, Article 2 C, the same length D, cannot be compared.

20. Li Hua rides a bike 1/3 hours, and the journey is 4/ 15 kilometers. According to this calculation, how many hours does it take him to travel 12km by bike?

2 1. Judgment: the circumference of a semi-circle is half that of a circle. ( )

The area of a semicircle is half that of a circle. ( )

22. Mr. Zhang spent 20% of his total money on books, 15% on fruits, _ _ _ _ _ _ _ _. How much money did he bring?

(1) * * * is 70 yuan.

② It costs less to buy fruit than books 10 yuan.

③ There is 130 yuan left.

23. The radius of the great circle is equivalent to the diameter of the small circle, and the sum of the areas of these two circles is 100 square centimeter.

The area of the great circle is () square centimeters.

24. Add () kg of water to 30 kg of salt, and you can get salt water with a salt content of 30%.

25. A commodity was sold at 60% off its original price 18 yuan, losing money to 2 yuan. You can make money by selling at the original price.

( )%

26. The toy store sells two electric toys at the same time. The unit price of each toy is 120 yuan, and one of them.

You can earn 25% on one piece and pay 20% on the other. Selling these two electric toys at the same time is to make money.

Still losing money? If it is to make money, how much money can you earn? If it is a loss, how much will it cost?

27. Divide a 4/5m rope into four sections on average, each section is () meters long, and each section accounts for () of the total length.

28, 20 is 30 (); 0/5 of 65438+20 is ();

1/8 of () is1/4; 5/6 () is 30.

29, ①1/4 More than 20 meters is () meters; ② 20m is 1/4 less than () m;

③ 1/4 > () is 20m41/4m () and 20m above.

30. If A is 1/4 of B, then A is less than B ()%.

3 1, a rice mill can grind 2 tons per hour, 1 hour can grind () tons, and it takes () hours to grind 1 ton of rice.

32. The oil yield of a rapeseed is 35%, 420 kg of rapeseed can extract () kg of oil, and it takes () kg of rapeseed to extract 420 kg of oil.

33. From place A to place B, car A needs 10 hour and car B needs 15 hour ... The speed ratio between car A and car B is (). If Party A and Party B start from AB at the same time, when they meet, the distance ratio between the two cars is ().

Uh, hehe! Come on!