1. A cylinder is vertically cut into several equal parts along the radius of its bottom surface to form an approximate cuboid with the same height as the bottom surface, and the surface area is increased by 20 square centimeters. It is known that the height of this cylinder is 10CM and the volume is (3 1.4) cubic CM.

2. Cylindrical, with a bottom area of 8 square centimeters and a height of 3 centimeters, changed to a conical iron block with a floor machine 12 square centimeter and a height of (6) centimeters.

3. A rectangular iron sheet with a length of 28.26CM and a width of 15.7CM and a circular iron sheet with a diameter of (9) cm can be made into a container with as large a volume as possible.

4. 12 divided by16 = (60): 80 = 2.4: (3.2) = (75)% 2 and its reciprocal ratio is (4: 1).

5. The repair is two thirds of the last repair, and the ratio of the length of the repair to the length of this road is (2:5).

6. The ratio of A.B. is 0.8, the simplest integer ratio of A.B. is (4:5), and B is (25)% more than A..

7. After the number of teams in Class A is adjusted to Class B by 1, the numbers are equal. It turns out that the ratio of the two classes is (9:7).

8. (30)1+(6)1= 51(fill in two different integers)

9. Divide the apples, with average per person 12 yuan. If you only give it to Class A 20 yuan, give it to Class B 30 yuan.

10. 1 red, 2 yellow and 3 blue, so you can touch 100 times at will, and the number of times you touch yellow accounts for (3) of the total (1).

Whew, I'm so tired!