Предмет: Математика, автор: evagonhcar

1). 6x - 70 = 7-x
2). 0,7x + 3 = 0,3x - 9
3). 0,6 ( x - 2) + 4,6 = 0,4 × 7 + x

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Ответы

Автор ответа: Svita14
1

1)6x - 70 = 7-x

6х+х=70+7

7х=77

х=77:7

х=11

Ответ: х=11

2)0,7x+3 = 0,3x-9

0,7х-0,3х= -9-3

0,4х= -12

х= -12:0,4

х= -30

Ответ: х= -30

3)0,6*(x-2)+4,6=0,4*7+x

0,6х-1,2+4,6=2,8+х

0,6х-х=2,8-4,6+1,2

-0,4х= -0,6

х= -0,6:(-0,4)

х= 1,5

Ответ: х=1,5

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