题目
已知实数x,y满足x-y=2,x方+y方=4,求x,y的值
提问时间：2021-03-27
答案
x=y+2
x^2+y^2=(y+2)^2+y^2=4,则y=0,x=2
x^2+y^2=(y+2)^2+y^2=4,则y=0,x=2
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