Câu hỏi của Phùng Phạm Quỳnh Trang

Question

Tìm x :

c, x^3 - 3x^2 + 3x - 2 = 0

Đoàn Trần Quỳnh Hương · Accepted Answer

$x^3-x^2+x-2x^2+2x-2$ =0

$x\left(x^2-x+1\right)-2\left(x^2-x+1\right)=0$

$\left(x-2\right)\left(x^2-x+1\right)$=0

$\left\{{}\begin{matrix}x=2\x^2-x+1=0\end{matrix}\right.$

$\left\{{}\begin{matrix}x=2\x=\dfrac{1\pm}{3}\end{matrix}\right.\sqrt{3}}$Câu trả lời: $x^3-x^2+x-2x^2+2x-2$ =0

$x\left(x^2-x+1\right)-2\left(x^2-x+1\right)=0$

$\left(x-2\right)\left(x^2-x+1\right)$=0

$\left\{{}\begin{matrix}x=2\x^2-x+1=0\end{matrix}\right.$

$\left\{{}\begin{matrix}x=2\x=\dfrac{1\pm}{3}\end{matrix}\right.\sqrt{3}}$