Question

 BÀI 1

a,11-x=12=8x

b,|4x-8|=1-x

c,2x+1/2+3_>3-5x/3-4x+1/4

CÁC BẠN GIÚP MÌNH VỚI CẦN GẤP LẮM 

CẢM ƠN

 

Answer 1

bạn viết rõ đề ra nhé

b, \(\left|4x-8\right|=1-x\)ĐK : \(x\le1\)

TH1 : \(4x-8=1-x\Leftrightarrow5x=9\Leftrightarrow x=\dfrac{9}{5}\)( ktm )

TH2 : \(4x-8=x-1\Leftrightarrow3x=7\Leftrightarrow x=\dfrac{7}{3}\)( ktm )

 

Answer 2

b) Ta có: \(\left|4x-8\right|=1-x\)

\(\Leftrightarrow\left[{}\begin{matrix}4x-8=1-x\left(x\ge2\right)\\4x-8=x-1\left(x< 2\right)\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}4x+x=1+8\\4x-x=-1+8\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}5x=9\\3x=7\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{9}{5}\left(loại\right)\\x=\dfrac{7}{3}\left(loại\right)\end{matrix}\right.\)