[ a^(n+4) - a^(3n) ] / [ a^(3n+3) - a^(n+7) ] =?
thanks a lot!!
Laws of Integral
2010-11-07 10:49 pm
回答 (1)
2010-11-07 11:34 pm
✔ 最佳答案
[ a^(n+4) - a^(3n) ]a^n(a^4-a^2n)
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a^(3n+3) - a^(n+7)
(a^n+3)(a^2n-a^4)
-(a^n+3)(a^4-a^2n)
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a^n(a^4-a^2n)/-(a^n+3)(a^4-a^2n)
a^n/-(a^n+3)
a^n/-(a^n)(a^3)
1/-a^3
2010-11-07 15:35:50 補充：
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參考: , 魔龍帝齊格益力多
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20101107000051KK00784