4) 2,8 5) 0,6a 0,08b; 6) 1,1x 1,4y; 7) 0,27m 0,3n; 8) 0,4a8b0,3c; 9) 1,2x 0,3y. 5z.

Ответ:

4)

2,8 ⋅ y ⋅ 0,5 = 2,8 ⋅ 0,5 ⋅ y = 1,4y

5)

0,6a ⋅ 0,08b = 0,6 ⋅ 0,08 ⋅ a ⋅ b = 0,048ab

6)

1,1x ⋅ 1,4y = 1,1 ⋅ 1,4 ⋅ x ⋅ y = 1,54xy

7)

0,27m ⋅ 0,3n = 0,27 ⋅ 0,3 ⋅ m ⋅ n = 0,081mn

8)

0,4a ⋅ 8 ⋅ b ⋅ 0,3c = 0,4 ⋅ 8 ⋅ 0,3 ⋅ a ⋅ b ⋅ c = 0,96abc

9)

1,2x ⋅ 0,3y ⋅ 5z = 1,2 ⋅ 0,3 ⋅ 5 ⋅ x ⋅ y ⋅ z = 1,8xyz

Ответ: 4) 1,4y; 5) 0,048ab; 6) 1,54xy; 7) 0,081mn; 8) 0,96abc; 9) 1,8xyz.