已知M/x2−y2=2xy−y2x2−y2+x−yx+y,则M=_.
问题描述:
已知
=M
x2−y2
+2xy−y2
x2−y2
,则M=______. x−y x+y
答
∵
=M
x2−y2
+2xy−y2
x2−y2
,(x−y)2
x2−y2
=M
x2−y2
,2xy−y2+x2−2xy+y2
x2−y2
即
=M
x2−y2
.x2
x2−y2
∴M=x2.
故答案为:x2.