因式分解問題!

2007-02-14 6:48 am
3 (x+y)^2 - a (x+y)

回答 (2)

2007-02-23 10:40 pm
唔係好difficult
2007-02-14 6:52 am
3 (x+y)^2 - a (x+y)
=(x+y)^3(3-a) 把公恩式(x+y)抽出來,之後再把係數放左一起(3-a)


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