F.2數學題~
回答 (6)
2008-02-10 11:56 pm
✔ 最佳答案
(a^2 +1)^2 - 4a^2 = ? (a^2 + 1)^2 - 4a^2
= a^4 + 2a^2 + 1 - 4a^2
= a^2 - 2a^2 + 1
= (a^2 - 1)^2
2008-02-11 12:20 am
(a^2 +1)^2 - 4a^2 = ?
你把(a^2 +1)^2
看成 (a+b)^2 = (a^2 + 2ab + b^2)
姐係(a^2 +1)^2 = (a^2)^2 + 2(a^2)(1) + (1)^2
咁樣你明唔明d呀??
(a^2 +1)^2 - 4a^2
= (a^2)^2 + 2(a^2)(1) + (1)^2 -4a^2
= a^4-2a^2+1
= (a^2-1)^2
2008-02-10 16:25:50 補充：
你e條數係咪本書d數黎架??如果係應該有答案...但無step一係你post埋我答案出黎啦
你把(a^2 +1)^2
看成 (a+b)^2 = (a^2 + 2ab + b^2)
姐係(a^2 +1)^2 = (a^2)^2 + 2(a^2)(1) + (1)^2
咁樣你明唔明d呀??
(a^2 +1)^2 - 4a^2
= (a^2)^2 + 2(a^2)(1) + (1)^2 -4a^2
= a^4-2a^2+1
= (a^2-1)^2
2008-02-10 16:25:50 補充：
你e條數係咪本書d數黎架??如果係應該有答案...但無step一係你post埋我答案出黎啦
2008-02-11 12:08 am
(a²+1)²-4a²
=a^4+1+2a²-4a²
=a^4-2a²+1
=(a²-1)²
=a^4+1+2a²-4a²
=a^4-2a²+1
=(a²-1)²
2008-02-11 12:08 am
(a^2 +1)^2 - 4a^2
=(a^2 +1)(a^2 +1)-4a^2
=a^4+a^2 +a^2 +1 -4a^2
=1+a^4-2a^2
5知岩5岩 希望能幫您!!!
2008-02-10 22:56:50 補充：
個個都好叻!!! 識用 (a b)² = a² 2ab b² 大家都得答案=(a²-1)² but (a²-1)²=a^4-2a^2 1即我原先答案 : 1 a^4-2a^2 5知岩5岩!!!!
2008-02-10 22:57:20 補充：
個個都好叻!!! 識用 (a b)² = a² 2ab b²
2008-02-10 22:58:43 補充：
個個都好叻!!! 識用 (a+b)² = a²+2ab+b² 個加5出!!
2008-02-10 23:00:44 補充：
個個都好叻!!! 識用 (a+b)² = a²+2ab+b²大家都得答案=(a²-1)²but (a²-1)²=a^4-2a^2+1即我原先答案 : 1+a^4-2a^2 5知岩5岩!!!!
2008-02-10 23:01:40 補充：
終於得la!!! 汗""
=(a^2 +1)(a^2 +1)-4a^2
=a^4+a^2 +a^2 +1 -4a^2
=1+a^4-2a^2
5知岩5岩 希望能幫您!!!
2008-02-10 22:56:50 補充：
個個都好叻!!! 識用 (a b)² = a² 2ab b² 大家都得答案=(a²-1)² but (a²-1)²=a^4-2a^2 1即我原先答案 : 1 a^4-2a^2 5知岩5岩!!!!
2008-02-10 22:57:20 補充：
個個都好叻!!! 識用 (a b)² = a² 2ab b²
2008-02-10 22:58:43 補充：
個個都好叻!!! 識用 (a+b)² = a²+2ab+b² 個加5出!!
2008-02-10 23:00:44 補充：
個個都好叻!!! 識用 (a+b)² = a²+2ab+b²大家都得答案=(a²-1)²but (a²-1)²=a^4-2a^2+1即我原先答案 : 1+a^4-2a^2 5知岩5岩!!!!
2008-02-10 23:01:40 補充：
終於得la!!! 汗""
2008-02-10 11:59 pm
(a^2 + 1)^2 - 4a^2
= (a^4 +2a^2 + 1) - 4a^2
= a^4 - 2a^2 + 1
= (a^2 - 1)^2
= (a^4 +2a^2 + 1) - 4a^2
= a^4 - 2a^2 + 1
= (a^2 - 1)^2
參考: me
2008-02-10 11:56 pm
=a^4+2a^2+1-4a^2
=a^4-2a^2+1
=(a^2-1)^2
=(a+1)^2*(a-1)^2
=a^4-2a^2+1
=(a^2-1)^2
=(a+1)^2*(a-1)^2
收錄日期: 2021-04-23 19:37:30
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https://hk.answers.yahoo.com/question/index?qid=20080210000051KK01554