4x^2-36z^2-28xy+49y^2 =??
要步驟!!
因式分解!!幫下手
2009-09-24 1:39 am
回答 (2)
2009-09-24 1:44 am
✔ 最佳答案
4x^2-36z^2-28xy+49y^2= (4x^2 - 28xy + 49y^2) - 36z^2
= [(2x)^2 - 2(2x)(7y) + (7y)^2] - (6z)^2
= (2x - 7y)^2 - (6z)^2
= (2x - 7y - 6z) (2x - 7y + 6z)
2009-09-25 1:47 am
樓上知唔知咩叫因識分解架
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090923000051KK00990