题目内容
(2013•团风县模拟)化简:
÷
-
=
x-y |
x+3y |
x2-y2 |
x2+6xy+9y2 |
2y |
x+y |
1
1
.分析:根据分式混合运算的法则进行计算即可.
解答:解:原式=
÷
-
=
×
-
=
-
=
=1.
故答案为:1.
x-y |
x+3y |
(x+y)(x-y) |
(x+3y)2 |
2y |
x+y |
=
x-y |
x+3y |
(x+3y)2 |
(x+y)(x-y) |
2y |
x+y |
=
x+3y |
x+y |
2y |
x+y |
=
x+3y-2y |
x+y |
=1.
故答案为:1.
点评:本题考查的是分式的混合运算,熟知分式混合运算的法则是解答此题的关键.
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