Question

помогите пожалуйста даю 90 баллов ​

Answer 1

вот......фото прикрепила...

Answer 2

Пошаговое объяснение:

А

1) 2 3/4 : 5 1/2 = 11/4 : 11/2 = 11/4 * 2/11 = 1/2 * 1/1 = 1/2

2) 3 1/3 * 1/2 = 10/3 * 1/2 = 10/6 = 5/3 = 1 2/3

Б

1) 3 2/5 - 1 11/15 = 3 6/15 - 1 11/15 = 2 21/15 - 1 11/15 = 1 10/15 = 1 2/3

2) 2 2/5 * 1 2/3 = 12/5 * 5/3 = 4/1 * 1/1 = 4/1 = 4

В

1) 1 3/5 + 2 1/5 = 3 4/5

2) 3 4/5 : 1 9/10 = 19/5 : 19/10 = 19/5 * 10/19 = 1/1 * 2/1 = 2/1 = 2

3) 1 7/10 - 4/5 = 17/10 - 8/10 = 9/10

4) 9/10 : 3/7 = 9/10 * 7/3 = 3/10 * 7/1 = 21/10 = 2 1/10

5) 2 + 2 1/10 = 4 1/10

№2

4/15 : х = 2/5

х = 4/15 : 2/5

х = 4/15 * 5/2

х = 2/3 * 1/1

х = 2/3