Предмет: Математика, автор: gnut2008

Математика.
Помогите , пожалуйста
​

Приложения:
uchihaitachi66854: это 5 класс?
adamovskaanatalia: в моем ответе ( \ ) это дробь

Ответы

Автор ответа: adamovskaanatalia
1

Ответ:

Пошаговое объяснение:

1)8x = 40

x=5

2)27=3x-9-3

27=3x-12

-3x=-12-27

-3x=-39

x=13

3)2\7x =3- 1\7x

2x=-21-x

2x+x=-21

3x=-21

x=-7

4)-5\8x=-3\4x+2

-5x-6x+16

-5x+6x=16x=16

5)2\9x-1=0

2x-9=0

2x=9

x=9\2

6)3(x+7\3)-20=x+7

3x+7-20=x+7

3x-20=x

3x-x=20

2x=20

x=10

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