已知x²-y²=55,x+y=11,则x-y的值为

来源：学生作业学帮网编辑：学帮网时间：2024/05/31 11:19:17

x²-y²
=（x+y) (x-y)
所以,x-y=（x²-y²）/ (x+y)
=55/11
=5

（x y）（x-y）=55
11（x-y）=55
x-y=5

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