Помогите пожалуйста решить номер!!Безотлагательно!

Ответ:

Пошаговое изъясненье:

1 2/3 * х = 5/13 * 2,6

5/3*х = 5/13 * 13/5

5/3*х = 1

х = 1 : 5/3 = 1 * 3/5

х = 3/5

1 1/5 * (2/3 *х + 5/6) = 3,4

2/3 *х + 5/6 = 3,4 : 1 1/5

2/3 *х + 5/6 = 17/5 : 6/5 = 17/5 * 5/6

2/3 *х + 5/6 = 17/6

2/3 *х = 17/6 - 5/6

2/3 *х = 12/6 = 2

х = 2 : 2/3 = 2 * 3/2

х = 3

2 1/3 *х = 3,6 * 5/18

2 1/3 *х = 18/5 * 5/18

2 1/3 *х = 1

х = 1 : 7/3 = 1 * 3/7

х = 3/7

1 1/5*(3/7 *х - 1/6) = 3,4

3/7 *х - 1/6 = 17/5 : 6/5 = 17/5 * 5/6

3/7 *х - 1/6 = 17/6

3/7 *х = 17/6 + 1/6

3/7 *х = 18/6 = 3

х = 3 : 3/7 = 3 * 7/3

х = 7