1)2x^n+1-7x^n-30x^n-1 (n大於或=1)
2)9-x^2-y^2+2xy
maths
2007-11-28 6:17 am
回答 (1)
2007-11-28 6:39 am
✔ 最佳答案
1)2x^n+1-7x^n-30x^n-1 (n大於或=1)=2x^n-7x^n-30x^n
=(2-7-30)x^n
=-35x^n
2)9-x^2-y^2+2xy
=9-(x^2-2xy+y^2)
=3^2-(x-y)^2
=(3+x-y)(3-x+y)
收錄日期: 2021-04-25 17:17:29
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https://hk.answers.yahoo.com/question/index?qid=20071127000051KK04030