I. Fill in the blanks (20 points)

1. Rewrite 3.6× 1.5= 1.8×3 into a ratio of ().

2. According to, then the ratio of A and B is ().

3. In proportion, the two internal terms are 10 and, one is 4.5 and the other is ().

4. The line segment scale indicates that the line segment of 1 cm on the map is equivalent to the actual distance () kilometers, and the numerical scale is rewritten as ().

5. In proportion, the two outer terms are reciprocal, so the product of the two inner terms is ()

6. The tooth ratio of the big and small gears is 5:3, the small gear has 15 teeth, and the big gear has () teeth.

7. If (A and B are not 0), then (): ()

8. The base of a triangle is 20cm, and its height is proportional to its area.

9.3, 4, 9, 12 can form a proportion. If it is determined that 3 is the first term of the ratio, then the ratio is ().

10. When drawing on the drawing, the length of the part is 10 mm, 5 cm. The scale of this picture is ().

Second, the small judge (10)

1. Two expressions with equal ratios are called ratios. ( )

The scale is a ruler. ( )

3. The last item of the ratio cannot be 0 ()

The radius of a circle is proportional to its area. ( )

5. The unknown term in the proportion is called the solution ratio ().

Third, merit-based admission (12 points)

1. In the following formula, () is the proportion. A, B, C,

2.x and y( )A are directly proportional to b and inversely proportional to c, out of proportion.

3. If (A and B are not 0), then the correct ratio is ().

A, B, C,

4. The ratio of energy to components is () A, B, C,

5. The playground of xia zhuang primary school is108m long and 64m wide. In the exercise book, the proportion of () is appropriate.

A, B, C,

6. On the map with the scale of 6: 1, the measured distance from A to B is 1.2 cm, and the actual distance from A to B is ().

a，7.2cm b，2cm c，0.2cm。

Fourth, draw the corresponding graphics according to the requirements. I believe you are the best (10).