1. The sector is a figure surrounded by two circles and a line segment on the circle.

2. Among rectangles, squares, equilateral triangles and circles, the figure with the least number of symmetry axes is—.

3. Draw the largest circle in a square with a side length of 100cm. Its diameter is-if you draw the largest circle in a rectangle 60 cm long and 40 cm wide, its radius is-.

4. The two terms at both ends of the ratio are called proportions, and the two terms in the middle are called proportions.

5. In proportion, the two external terms are 18 and 2.4, one of which is 1.5, and the other is-.

6. In proportion, both internal terms are 1/4, one is the smallest prime number and the other is-.

7. The sum of the numbers A, B and C is 740, the ratio of A to B is 3:4, and the ratio of B to C is 3:4. Then the numbers A, B and C are ———— respectively.

8. 80% of a project has been completed, that is to say,-is regarded as 100, and-accounts for 80 of them.

9. Convert 75% into decimals, first remove the percent sign, and then move the decimal point 75 to-1.

The percentage of 10.0.9 is-. 0. 1% is converted to decimal.

1 1. There are 24 red carp and 16 herring in the fish pond. The number of red carp is the number of green carp-the number of green carp is the number of red carp. Keep a decimal place before the percent sign. )

12. The fruit juice beverage is pure fruit juice and water in a ratio of 2:5. If this beverage is prepared, 350ml needs pure juice-ml.

13. A medicinal liquid is prepared from medicinal powder and water at the ratio of 1∶30. Now there are 30 kilograms of powder, which can be made into 20 kilograms of liquid medicine.

Second, multiple choice questions

1.6 1 The passing rate of the final exam is 98%. 95% lawyers in the final exam of class 62.

A: There are many people who have passed the 6 1 level.

B There are many people who have passed Class Six and Class Two.

C can't determine which class has passed more people.

2.

Mix 3 kg of water and 3 g of medicinal powder into liquid medicine, and the mass ratio of medicinal powder to liquid medicine is ()

A 1: 100 .

B 1: 1000 .

C 1: 100 1 .

3. In proportion, an external item is restored to the original110. To make the proportion hold, the following statement is wrong ().

A is expanded tenfold with an external item.

B One of the entries is reduced to the original110.

C one of them has been expanded tenfold.

4.

Three true or false questions.

1.3/4 can be regarded as a fraction, a ratio and a ratio.

Fourth, the calculation problem.

1. 15/7=x/35。

2.

x/3.6=0.6/3。

3.2.7:0.36

4.2/3:2/5

Fifth, answer questions.

1. Xiaohong reads a story book. The ratio of read pages to unread pages is 2:7. It is known that Xiaohong has read 24 pages. How many pages have not been read?

A afforestation team planted 236 trees last year, and 226 trees survived. 3 18 trees were planted this year, and 8 trees did not survive. Which year has a higher survival rate?