2, 3/10 ÷ 3/8 = 4/5g

3,8 ÷ 40/57 = 57/5km/s

4, 9 (1-110) =10 kg.

5、=3/ 16 =3/50 = 10 = 136 =3/5 =4/7 = 1/2 =343/ 144 =3 =5/8

6. (1500+1000) × 3/5 =1500 yuan.

7, 48 ÷ 4/5+48 = 1.08 million units

85200/52/55 = 5500 km

9.( 1) Total number of winning works: 241/2 = 48 first prize 48× 1/6=8 second prize 48×1/3 =16 (2) 48.

10、x = 125/2 16 x = 1/27 x = 175/27

1 1, 2/5 ÷ 4 =110 (1-2/5) ÷1/kloc-0 = 6 cars.

12, (1) 28÷1/5 =140 (2) 80÷ (1-4/5) =16 weeks.

13,1804 ÷ 39/40 =18.5 million tons.

14,9000÷ (1-1/46) = 92 million people.

The last question (1) is 1/2 of the previous question. 1/ 10 , 1/40 , 1/80

(2) The latter is 3/2 of the former. 8 1/32 , 243/64