Question

|x-3|=|5|+|-7|

tìm x nha

 

Answer 1

\(\left|x-3\right|=\left|5\right|+\left|-7\right|\)

\(\Rightarrow\left|x-3\right|=5+7\)

\(\Rightarrow\left|x-3\right|=12\)

\(\Rightarrow\left[{}\begin{matrix}x-3=-12\\x-3=12\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=-12+3\\x=12+3\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=-9\\x=15\end{matrix}\right.\)

Answer 2

=>|x-3|=12

=>x-3=12 hoặc x-3=-12

=>x=-9 hoặc x=15