已知|2x+y-3|+x-3y-5=0则x^2=?
问题描述:
已知|2x+y-3|+x-3y-5=0则x^2=?
答
已知|2x+y-3|+|x-3y-5|=0
2x+y-3=0
x-3y-5=0
2x+y=3
x-3y=5
7x=14
x=2
x^2=4