问题 填空题
2xy-y2
x2-y2
+
x-y
x+y
=
m
x2-y2
,则m=______.
答案

2xy-y2
x2-y2
+
x-y
x+y
=
m
x2-y2

2xy-y2
x2-y2
+
(x-y)2
x2-y2
=
x2
x2-y2

故答案为:x2

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