1.2 1.2 1.9.

Two.

(6.4+3.6)* 2 = 10 * 2 = 20m(5+7)* 2 = 12 * 2 = 24cm。

Three.

3. 14* 1 square = 3.14 *1= 3.14 square centimeter 6-2=4 meters, 10-2=8 meters, 4 * 8.

Four.

= 1- 128 1= 128 127

Five.

30÷2= 15 minutes 90- 15=75 minutes 75*2= 150 minutes or more, the answers are all 43 pages.

One.

5/8, 3/3, 5/5, 2/5, 3/2, 3/3, 1/2, 1.

Two.

In Germany, the price ratio of coat and trousers is 5:4.

Coat: 1800 * 5/9 = 1000 Yuan Pants: 1800- 1000=800 yuan.

Three. The ratio of rooster to hen is 3:5.

Rooster: 40 * 3 of 8 =15 hens: 40 * 5 of 8 = 25 hens.

Four. 90 ÷ 3 = 30cm, 30 * 4 =120cm. The answers are all 44 pages.