已知有理数x,y满足|x+y-5|+(x-y+3)的2次方=0,求x,y的值
问题描述：
已知有理数x,y满足|x+y-5|+(x-y+3)的2次方=0,求x,y的值
答
|x+y-5|+(x-y+3)的2次方=0
因为|x+y-5|>=0 (x-y+3)的2次方>=0
则x+y-5=0
x-y+3=0
解得
x=1
y=4