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Автор - tany19981016

решите уравнения х*2+7х-18=0

Ответ

Автор - Deutsch2014
D=49+72=121
x1= -7+11/2=2
x2= -7-11/2= -9

Ответ

Автор - Akula17
2x+7x-18=0
9x - 18 = 0
9x= 18
x=2 
Ответ:2
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