As follows:
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Maths
2010-02-09 12:21 am
回答 (1)
2010-02-09 12:40 am
✔ 最佳答案
Sol
設兩根 a，a^ 2
a+a^2=－p
a*a^2=a^3=q
So
q(3p－1)－q^2
=a^3[3(－a－a^2)－1]－-a^6
=a^3(－3a－3a^2－1)－-a^6
=－a^6－3a^5－3a^4－-a^3
=－a^3(a^3+ 3a ^2+ 3a +1)
=－a^3(a+1)^3
=p^3
收錄日期: 2021-04-23 18:22:50
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100208000051KK00801