> 数学 >
化简：1-
x+y
x-3y
÷
x2-y2
x2-6xy+9y2
= ___ ．
人气：116 ℃　时间：2020-03-30 12:47:20
解答
1-
x+y
x-3y
÷
x2-y2
x2-6xy+9y2
=1-
x+y
x-3y
•
(x-3y)2
(x+y)(x-y)
=1-
x-3y
x-y
=
x-y-x+3y
x-y
=
2y
x-y
．
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