maths question

用戶5881

2007-12-27 2:45 am

factorize 4a^2-b^2+4b-4

回答 (2)

用戶107075

2007-12-27 3:12 am

好似係b(4-b)+4(a^2-1)

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用戶19657

2007-12-27 3:10 am

4(a^2-1)+b(4-b)

2007-12-26 19:12:16 補充：
=4(a+1)(a-1)-b(4-b)

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