Cho mik hỏi 2 câu này nx 8x³-12x²+6x-1=0 vs 3x³-6x²+9x=0

1 câu trả lời

$8x^3-12x^2+6x-1=0$

$\Rightarrow (2x-1)^3=0$

$\Rightarrow 2x-1=0$

$\Rightarrow x=\dfrac{1}{2}$

$3x^3-6x^2+9x=0$

$\Rightarrow3x(x^2-2x+3)=0$

$\Rightarrow 3x[(x-1)^2+2]=0$

Do $(x-1)^2+2>0$ $\forall x$

$\Rightarrow 3x=0$

$\Rightarrow x=0$