（1 /（x-2)(x-3))-(2/(x-1)(x-3))+(1/(x-1)(x-2)) 等于多少 刷分的滚

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（1 /（x-2)(x-3))-(2/(x-1)(x-3))+(1/(x-1)(x-2)) 等于多少 刷分的滚
（1 /（x-2)(x-3))-(2/(x-1)(x-3))+(1/(x-1)(x-2)) 等于多少 刷分的滚

（1 /（x-2)(x-3))-(2/(x-1)(x-3))+(1/(x-1)(x-2)) 等于多少 刷分的滚
1/(x-2)(x-3)-2/(x-1)(x-3)+1/(x-1)(x-2)
=(x-1)/(x-2)(x-3)(x-1)-2(x-2)/(x-1)(x-2)(x-3)+(x-3)/(x-1)(x-2)(x-3)
=【x-1-2x＋4＋x-3】/(x-1)(x-2)(x-3)
=【0】/(x-1)(x-2)(x-3)
=0

（1 /（x-2)(x-3))-(2/(x-1)(x-3))+(1/(x-1)(x-2))
=1 /（x-3)-1/(x-2)-(1/(x-3)+1/(x-3))+1/(x-2)+1/(x-1)
=1 /（x-3)-1/(x-2)-1/(x-3)-1/(x-3))+1/(x-2)+1/(x-1)
=0

都可以裂项。

你们晚了一步  sorry<...
全部展开
（1 /（x-2)(x-3))-(2/(x-1)(x-3))+(1/(x-1)(x-2)) 
=1 /（x-3)-1/(x-2)-(1/(x-3)+1/(x-3))+1/(x-2)+1/(x-1)
=1 /（x-3)-1/(x-2)-1/(x-3)-1/(x-3))+1/(x-2)+1/(x-1)
=0
 
都可以裂项。
收起
[1 /（x-2)(x-3)]-[2/(x-1)(x-3)]+[1/(x-1)(x-2)]
=[﹙x-1﹚-2﹙x-2﹚+﹙x-3﹚]／[﹙x-1﹚﹙x-2﹚﹙x-3﹚]
=﹙x-1-2x+4+x-3﹚／[﹙x-1﹚﹙x-2﹚﹙x-3﹚]
=0.
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