Предмет: Математика, автор: Polina22122004

найди корень уравнения а) (x+2)+ x=9 б) x+(7+x)=11

Ответы

Автор ответа: ThEArTeMDiT

(x+2)+x=9
x+2+x=9
2x=9-2
2x=7
x=7/2
x=3½
x+(7+x)=11
x+7+x=11
2x=11-7
2x=4
x=4:2
x=2

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