Предмет: Алгебра, автор: kucherenkoivan

Розв’язати рівняння 7х – 8 = 5х + 12. 2) 3(х - 7) +2х = 5х - 21

Ответы

Автор ответа: ludmilaksenija2005

0

Объяснение:

7х-8=5х+12

7х-5х=12+8

2х=20

х=20:2

х=10

2)

3(х-7)+2х=5х-21

3х-21+2х=5х-21

5х-21=5х-21

5х=5х - верно

х∈R

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