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x³=0 U x³-1=0 U 1+x³=0
x³=1 x³=-1
x=1 x=-1
x∈(-1,0,1)
e)(x³+2x)(x³+2)(x³+x)=0
x³(2x+2+x)=0
x³(3x+2)=0
x³=0 U 3x+2=0
x=0 3x=-2
x=-⅔
x∈(-⅔.0)