Verified answer

Ответ:

Объяснение:

(2/9)х - 1/3 = 4х + 2 1/2

4х - (2/9)х = - 2 1/2 - 1/3

(36/9)х - (2/9)х = - 5/2 - 1/3

(34/9)х = - 15/6 - 2/3

х = - 17/6 : 34/9

х = - 17/6 * 9/34

х = -3/4

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1) - 12,6 * 1 1/9 = -12,6 * 10/9 = - 126/9 = -14

2) -14 + 10,8 = -3,2

3) -3,2 : 6 6/7 = -3,2 : 48/7 = -3,2 *  7/48 = -22,4/48 = -224/480 = - 7/15

4) -7/15 + 2 3/10 = - 14/30 + 2 9/30 = 1 39/30 - 14/30 = 1 25/30 = 1 5/6

Ответ: 1  5/6