更新1:
use factorization// i need detail...THANKS !!!!!!! =]=]
MATHZ (F.3) one Q before 2:30 p.m
回答 (2)
2008-09-06 10:26 pm
✔ 最佳答案
記得呢條公式嗎???a^2-b^2 =(a+b)(a-b)
再抽因子就計到..
( x ^2 - y ^2 ) + 2x - 2y
=(x-y)(x+y)+2(x-y)
=(x-y)(x+y+2)
2008-09-06 10:22 pm
( x ^2 - y ^2 ) + 2x - 2y
=(x-y)(x+y)+2(x-y)
=(x-y)(x+y+2)
=(x-y)(x+y)+2(x-y)
=(x-y)(x+y+2)
收錄日期: 2021-04-23 20:36:24
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080906000051KK01265