Question

Tìm giá trị của x:

|0,2.x-3.1|+|0,2.x+3,1|=0

Answer 1

\(\left|0,2x-3,1\right|+\left|0,2x+3,1\right|=0\)

\(\Leftrightarrow\left\{{}\begin{matrix}\left|0,2x-3,1\right|=0\\\left|0,2x+3,1\right|=0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}0,2x-3,1=0\\0,2x+3,1=0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}0,2x=3,1\\0,2x=-3,1\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x=15,5\\x=-15,5\end{matrix}\right.\) (vô lí)

Vậy ko tìm dc x thỏa mãn theo yêu cầu