(2)9 32 80

(3)32 8 1

(4)4:5 5:4

(5)2:3: 15

2、3/7 3/4 3/2 1/40

3500/( 1+ 1/3)= 375 copies.

4. Big hen (10-9)×2× 10=20 (hen) × 2× 9 = 18 (hen).

5,35× (4 out of 7, 5 out of 9) = 36 (piece)

6.( 1) 6 cm long and 4 cm wide (2) 5 cm long and 3 cm wide

7,5+6 =11180 divided by 1 1.6 = 330 (km).