Giải các phương trình : 1, x^2+8x=0 2, x^2-2xcăn 2+2=0 3, 3x^2-10x+8=0 4, 2x^2-2x+1=0

Trả lời

$\begin{array}{l}1)x^2+8x=0\iff \left[\begin{array}{l}x=0\\ x=-8\end{array}\right.\\ 2)x^2-2x\sqrt{2}+2=0\iff {\left(x-\sqrt{2}\right)}^2=0\iff x=\sqrt{2}\\ 3)3x^2-10x+8=0\iff \left[\begin{array}{l}x=2\\ x=\frac{4}{3}\end{array}\right.\\ 4)2x^2-2x+1=0co\text{'}\Delta \text{'}=-1<0\Rightarrow PTVN\end{array}$