已知x-y=8,x-y=2,求x+y的值

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已知x-y=8,x-y=2,求x+y的值已知x-y=8,x-y=2,求x+y的值已知x-y=8,x-y=2,求x+y的值题写错了吧乍一看不会（x-y）^2=x^2-2xy+y^2=x^2+2xy+y^

已知x-y=8,x-y=2,求x+y的值
已知x-y=8,x-y=2,求x+y的值

题写错了吧

乍一看不会

（x-y）^2=x^2-2xy+y^2=x^2+2xy+y^2-4xy=(x+y)^2-4xy=4
(x+y)^2=4+4xy=4+32=36
x+y=6或-6
求采纳为满意回答。

收起

x等于3，y等于1

x=3,y=1,x+y=10

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