[Toán 7]Tìm x

H

huy14112



$|2x - 3| - x = |2 - x|$

TH1:$2x-3-x=|2-x|$

$\left\{\begin{matrix}2x-3-x=2-x \longrightarrow x=-0,5\\ 2x-3-x=x-2 \longrightarrow vo nghiem\\ \end{matrix}\right.$

TH2: $3-2x-x=|2-x|$

$\left\{\begin{matrix}3-2x-x=2-x \longrightarrow x=0,5\\ 3-2x-x=x-2 \longrightarrow x=\dfrac{5}{4}\\ \end{matrix}\right.$

Vậy có 3 nghiệm : $\pm 0,5 ; \dfrac{5}{4}$


 
Last edited by a moderator:
You must log in or register to reply here.
Top Bottom