Question

|x-3| + |y-2x | =0         |x| + 3|2x -x ² | =0          |5x ² -5 | + 4|y-7 | =0                     ||x +1 | + |y-5 |=0         |x ² -1| + |y-1| =0          |x-1 | +|x ²-x |=0

Answer 1

a) Ta có: \(\left|x-3\right|+\left|y-2x\right|=0\)

\(\Leftrightarrow\left\{{}\begin{matrix}x-3=0\\y-2x=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=3\\y=2x=2\cdot3=6\end{matrix}\right.\)