Question

Answer 1

a, hai TH

TH1: 2x-4=3-3x -->x=7/5

TH2:4-2x=3-3x -->x=-1

b,a>b---->-a<-b-------->-4a+7<-4b+7

Answer 2

\(a,\left|2x-4\right|=3\left(1-x\right)\\ \Leftrightarrow\left[{}\begin{matrix}2x-4=3\left(1-x\right)\\2x-4=3\left(x-1\right)\end{matrix}\right.\left(đk:x\le1\right)\\ \Leftrightarrow\left[{}\begin{matrix}5x=7\\-x=1\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=\dfrac{7}{5}\\x=-1\end{matrix}\right.\)

\(b,a>b\\ \Leftrightarrow-4a< -4b\\ \Leftrightarrow-4a+7< -4b+7\)