化简 (1- +)+(a^3+a^2-a-1/a^2-3a+2)

问题描述:

化简 (1- +)+(a^3+a^2-a-1/a^2-3a+2)
1个回答 分类:数学 2014-10-21

问题解答:

我来补答
原式=(a-6)/(a+1)+12/(a+1)^2+(a+1)(a^2-1)/[(a-1)(a-2)]
=[(a-6)(a+1)+12]/(a+1)^2+(a+1)^2/(a-2)
=(a^2-5a+6)/(a+1)^2+(a+1)^2/(a-2)
=[(a^2-5a+6)(a-2)+(a+1)^4]/[(a-2)(a+1)^2]
=[a^4+4a^3+6a^2+4a+1
+a^3-5a^2+6a
-2a^2+10a-12]/[(a-2)(a+1)^2]
=(a^4+5a^3-a^2+20a-11)/[(a-2)(a+1)^2].
 
 
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