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Ответ дан
elbekabdukarimo

1)√х-81=0 √х=81 х=±9

2)√х+81=0 √х= -81 решения нет

3)|х|=81 х=±81

4)-√(2х^2)=0 √(2х^2)=0 2х^2=0 х^2=0

х=0

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