Решите уравнение 17•(3x-16)=85. 3•(8x+51) =201. (19x+62):15=13

1) 17 * (3х - 16) = 85,

3х - 16 = 85 : 17,

3х - 16 = 5,

3х = 5 + 16,

3х = 21,

х = 21 : 3,

х = 7.

Проверка:

17 * (3 * 7 - 16) = 85,

17 * (21 - 16) = 85,

17 * 5 = 85,

85 = 85.

2) 3 * (8х + 51) = 201,

8х + 51 = 201 : 3,

8х + 51 = 67,

8х = 67 - 51,

8х = 16,

х = 16 : 8,

х = 2.

Проверка:

3 * (8 * 2 + 51) = 201,

3 * (16 + 51) = 201,

3 * 67 = 201,

201 = 201.

3) (19х + 62) : 15 = 13,

19х + 62 = 13 * 15,

19х + 62 = 195,

19х = 195 - 62,

19х = 133,

х = 133 : 19,

х = 7.

Проверка:

(19 * 7 + 62) : 15 = 13,

(133 + 62) : 15 = 13,

195 : 15 = 13,

13 = 13.