Question

допоможіть дуже потрібно ​

Answer 1

Пошаговое объяснение:

21х - 5/7 = 2 2/7

21х = 2 2/7 + 5/7

21х = 2 7/7

21х = 3

х = 3 : 21

х = 3/21

х = 1/7 (А)

5 1/4 - 2/3х = 1 1/4

2/3х = 5 1/4 - 1 1/4

2/3х = 4

х = 4 : 2/3

х = 4 * 3/2

х = 12/2

х = 6 (Б)

1 5/6х + 3 = 8 1/2

1 5/6х = 8 1/2 - 3

1 5/6х = 5 1/2

11/6х = 11/2

х = 11/2 : 11/6

х = 11/2 * 6/11

х = 1/1 * 3/1

х = 3/1

х = 3 (В)

5 - 3/4х = 4 5/8

3/4х = 5 - 4 5/8

3/4х = 4 8/8 - 4 5/8

3/4х = 3/8

х = 3/8 : 3/4

х = 3/8 * 4/3

х = 1/2 * 1/1

х = 1/2 (Д)