題目如下:
Factorize this expressions
1. 3(a-b)(3r-t)+9(b-a)(2t-5s)
2. (2x+1)(x-y)-(3x+1)(x-y)
註:我想要步驟+答案，因為林左好來都唔明
我想問有無人識依幾條F.2的Maths題？
2008-08-02 9:27 pm
回答 (2)
2008-08-02 9:51 pm
✔ 最佳答案
As follow AS~~~圖片參考：http://www.photo-host.org/img/219321screenhunter_08_aug._02_13.49.gif
2008-08-02 13:51:55 補充：
慢左,給樓上的最佳!
2008-08-02 9:48 pm
1. 3(a-b)(3r-t)+9(b-a)(2t-5s)
=3(a-b)(3r-t)-9(a-b)(2t-5s)
=(a-b)[3(3r-t)-9(2t-5s)]
=(a-b)(9r-3t-18t+45s)
=(a-b)(9r+42s-18t)//
2. (2x+1)(x-y)-(3x+1)(x-y)
=(x-y)[(2x+1)-(3x+1)]
=(x-y)(2x+1-3x-1)
=x(y-x)//
=3(a-b)(3r-t)-9(a-b)(2t-5s)
=(a-b)[3(3r-t)-9(2t-5s)]
=(a-b)(9r-3t-18t+45s)
=(a-b)(9r+42s-18t)//
2. (2x+1)(x-y)-(3x+1)(x-y)
=(x-y)[(2x+1)-(3x+1)]
=(x-y)(2x+1-3x-1)
=x(y-x)//
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080802000051KK01157