题目内容
化简12 |
x2-9 |
2 |
x+3 |
分析:本题异分母分式,则必须先通分,把异分母分式化为同分母分式,然后再相加减.
解答:解:原式=
=
=
=
.
故答案为
.
12+2(x-3) |
(x+3)(x-3) |
2x+6 |
(x+3)(x-3) |
2(x+3) |
(x+3)(x-3) |
2 |
x-3 |
故答案为
2 |
x-3 |
点评:本题考查了分式的加减运算.解决本题首先应通分,最后要注意将结果化为最简分式.
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