Предмет: Алгебра, автор: kerimovavalera

Решите пожалуйста.
Дидактические материалы.Потапов,Шевкин.

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Автор ответа: fencingepee
0
1) поlставляешь а , считаешь на калькуляторе , аналогично 3 
2)2x-(7x-13)=1
2x-7x+13=1
-5x=1-13
-5x=-12
x=12/5=2.4
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