Ответ:
2x*(x^2 -81)=0
x*(x^2-81)=0
x=0
x^2-81=0
x=-9
x=9
:x1=-9 ,x2=0, x3=9
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Ответ:
2x*(x^2 -81)=0
x*(x^2-81)=0
x=0
x^2-81=0
x=0
x=-9
x=9
:x1=-9 ,x2=0, x3=9