(x+1)(x-1)(x^2-1)
咁樣計得唔得
=(X+1)(X-1)(X+1)(X-1)
=(X-1)^2(X+1)^2
=(X^2-2X+1)(X^2+2X+1)
=X^4-4X^2+1
中二數學一題
2007-11-01 5:28 am
回答 (5)
2007-11-01 10:26 pm
✔ 最佳答案
先用我果方法計先(x+1)(x-1)(x^2-1)
=(x^2-1^2)(x^2-1)
=(x^2-1)^2
=(x^2)^2-2(x^2)(1)+1^2
=x^4-2x^2+1//
如果我既答案係岩,而你既答案同我唔一樣,咁計係得嫁,你只不過係計錯數----
(x+1)(x-1)(x^2-1)
=(X+1)(X-1)(X+1)(X-1)
=(X-1)^2(X+1)^2
=(X^2-2X+1)(X^2+2X+1)
=X^4-4X^2+1 <--------呢度錯左
(X^2-2X+1)(X^2+2X+1)
=X^4-2X^3+X^2+2X^3-4X^2+2X+X^2-2X+1
=X^4-2X^2+1//
2007-11-01 7:03 am
rubbish
(x+1)(x-1)(x^2-1)
=(x^2-1^2)(x^2-1)
=(x^2-1)^2
=X^4-2X^2+1(ans)
(x+1)(x-1)(x^2-1)
=(x^2-1^2)(x^2-1)
=(x^2-1)^2
=X^4-2X^2+1(ans)
2007-11-01 6:06 am
(x+1)(x-1)=x^2-1
(x^2-1)(x^2-1)=x^4-2x^2+1 其中分別分三項 第一是 X^2 第二是 -1個X^2 再-1個X^2 =-2個X^2 第三: (-)(-)得正=+1
(x^2-1)(x^2-1)=x^4-2x^2+1 其中分別分三項 第一是 X^2 第二是 -1個X^2 再-1個X^2 =-2個X^2 第三: (-)(-)得正=+1
參考: myself
2007-11-01 5:36 am
答案似乎不正確。
=(x^2-1) (x^2-1)
=x(x-1) x(x-1)
=x(x^2-2x+1)
=(x^2-1) (x^2-1)
=x(x-1) x(x-1)
=x(x^2-2x+1)
2007-11-01 5:34 am
咁樣如果5係捉得緊都ok架!!! 咁計就無錯囉!!!
收錄日期: 2021-04-13 14:16:47
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071031000051KK03884