\(\left|x+5\right|=3x+1\)
t/hợp 1: \(x+5\ge0\Leftrightarrow x\le5\)
\(\Rightarrow x+5=3x+1\)
\(\Leftrightarrow5-1=3x-x\Leftrightarrow4=2x\)
\(\Leftrightarrow x=2\left(TMĐK\right)\)
t/hợp 2: \(x+5\)<0 \(\Leftrightarrow\)x>5
\(\Leftrightarrow-\left(x+5\right)=3x+1\)
\(-x-5=3x+1\)\(\Leftrightarrow-x-3x=5+1\Leftrightarrow-4x=6\Leftrightarrow x=-\dfrac{3}{2}\)
?? éo bt lm
mấy bài như lol này mà éo bt lm???