Question

Câu b, c, d ạ

Answer 1

a: =>x^3=x

=>x(x-1)(x+1)=0

=>\(x\in\left\{0;1;-1\right\}\)

b: =>x^3+9x^2=x^3+9x^2+27x+27

=>x=-1

c: =>5x^3-x^3+3x^2-3x+1=0

=>4x^3+3x^2-3x+1=0

=>x=-1,41