數學題....

2007-12-29 9:02 am
(a+b)^4-4(a+b)^2 = ?

回答 (3)

2007-12-29 8:19 pm
✔ 最佳答案
(a+b)^4-4(a+b)^2
=(a+b)^2[(a+b)^2-4]
=(a+b)^2[(a+b)^2-2^2]
=(a+b)^2(a+b-2)(a+b+2)

2007-12-29 12:21:05 補充:
樓上的,你錯了。(a b)(a b)在因式分解一定要變成(a b)^2。
參考: 自己
2007-12-31 11:15 pm
a^4+b^4-4a^2-4b^2

is it wrong
參考: me
2007-12-29 9:25 am
(a+b)^4-4(a+b)^2 = (a+b)^2 * [(a+b)^2 -4]
= (a+b)^2 * [(a+b)^2 -2^2]
= (a+b)^2 * [(a+b)- 2] [a+b +2]
= (a+b)(a+b)(a+b+2)(a+b-2)
參考: me


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