1. x2-(y-z)2
2. (a-b)-(a-b)2
math因式分解.........
2008-08-31 4:33 am
回答 (2)
2008-08-31 4:45 am
✔ 最佳答案
1. x2-(y-z)2
=(x-y+z)(x+y-z)//
2. (a-b)-(a-b)2
=(a-b)[1-(a-b)]
=(a-b)(1-a+b)//
2008-08-31 4:43 am
1. x2-(y-z)2
= x2-(y2-2yz+z2)
= x2-y2+2yz-z2)
2. (a-b)-(a-b)2
= (a-b)-(a2-2ab+b2)
= (a-b)-a2+2ab-b2
= a-b-a2+2ab-b2
= x2-(y2-2yz+z2)
= x2-y2+2yz-z2)
2. (a-b)-(a-b)2
= (a-b)-(a2-2ab+b2)
= (a-b)-a2+2ab-b2
= a-b-a2+2ab-b2
參考: 好似係咁~
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