F.3 Maths (Steps)
回答 (1)
2008-12-27 9:05 pm
✔ 最佳答案
a^2 - b^2 - a + b=(a+b)(a-b)-(a-b)
=(a-b)(a+b-1)//
參考: myself. don't try to copy my ans.
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081227000051KK00702