Решите уравнения : 7(x+20)=5x, 5(x+20)=7(x-20) , 5(x+20)=7, 7(x+20)=5(x-20). Created by appmap. matematika-ru

Решите уравнения : 7(x+20)=5x, 5(x+20)=7(x-20) , 5(x+20)=7, 7(x+20)=5(x-20)...

July 2022 1 0 Report

Решите уравнения : 7(x+20)=5x, 5(x+20)=7(x-20) , 5(x+20)=7, 7(x+20)=5(x-20)

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posah 1) 7х+140=5х
7х-5х=-140
2х=-140
х=-70
2) 5х+100=7х-140
5х-7х=-140-100
-2х=-240
х=120
3) 5х+100=7
5х=7-100
5х=-93
х=-18,6
4) 7х+140=5х-100
7х-5х=-100-140
2х=-240
х=-120

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