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математика 6 класс ​

Пошаговое объяснение:

I.

1) -6x = 48 | :(-6)

x = -8

2) -1.6x = -6.4 | :(-1.6)

x = 4

3) (-4/9)x = -1/7 | *(-9)

4x = 9/7 | :4

x = 9/28

II.

1) (-5/9 + 14/15) : (-17/30) = (-25/45 + 42/45) * (-30/17) = 17/45 * (-30/17) = -2/3

2) (17/24 - 19/30) : (-5/36 + 22/45) = (85/120 - 76/120) : (-25/180 + 88/180) =

= 9/120 : 64/180 = 27/128

III.

1) 8(6a - 7) -17a = 48a - 56 -17a = 31a - 56

2) 6b - 7(12-3b) = 6b - 84 + 21b = 27b - 84