F.3 Maths (Steps)

lok wang

2008-12-27 9:02 pm

factorize a^2 - b^2 - a + b

回答 (1)

Kara

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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