Ответ:

Пошаговое объяснение:

1.

а) 2/9 * 27/28 = 1/1 * 3/14 = 3/14

б) 5/24 * 18 = 5*18 / 24 = 90/24 = 3 18/24 = 3 3/4

2.

а) 1/12 : 1/6 = 1/12 * 6/1 = 6/12 = 1/2

б) 5/6 : 15 = 5/6 * 15 = 75/6 = 12 3/6 = 12 1/2

3.

а) 1 1/3 * 3 3/8 = 4/3 * 27/8 = 1/1 * 9/2 = 9/2 = 4 1/2

б) 2 1/3 : 2 4/5 = 7/3 : 14/5 = 7/3 * 5/14 = 1/3 * 5/2 = 5/6

4.

5 1/3 : х = 1 3/5

х = 5 1/3 : 1 3/5

х = 16/3 : 8/5

х = 16/3 * 5/8

х = 2/3 * 5/1

х = 10/3

х = 3 1/3

5.

60 * 2/5 = 120/5 = 24 - литра потратил

6.

120 : 3/4 = 120 * 4/3 = 480/3 = 160 - всего страниц в книге

7.

(3/7х - 5/6) * 1 2/3 = 2 1/2

3/7х - 5/6 = 2 1/2 : 1 2/3

3/7х - 5/6 = 5/2 * 3/5

3/7х - 5/6 = 3/2

3/7х = 3/2 + 5/6

3/7х = 9/6 + 5/6

3/7х = 14/6

3/7х = 7/3

х = 7/3 : 3/7

х = 7/3 * 7/3

х = 49/9

х = 5 4/9

8.

1) 320 * 0,25 = 80 (кг) - картошки

2) 320 * 0,20 = 64 (кг) - морковки

3) 320 - (80 + 64) = 320 - 144 = 176 (кг) - капусты