Help me!!!X((z-y)^2)+2X(y-z)=?
回答 (2)
2011-03-20 2:18 pm
✔ 最佳答案
X((z-y)^2)+2X(y-z)=?
X((z-y)^2) + 2X(y-z) = X(y-z)² + 2X(y-z)
化簡：
X(y-z)² + 2X(y-z)
= X(y-z) [(y-z) + 2]
= X(y-z) (y-z+2)
展開：
X(y-z)² + 2X(y-z)
= Xy² - 2Xyz + Xz² + 2Xy - 2Xz
= Xy² + Xz² - 2Xyz + 2Xy - 2Xz
2011-03-11 5:40 am
你係咪要expansion 定係要計答案
下面係expansion
X((z-y)^2)-2X(z-y)
=(z-y)(X(z-y)-2X)
=(z-y)(Xz-Xy-2X)
下面係expansion
X((z-y)^2)-2X(z-y)
=(z-y)(X(z-y)-2X)
=(z-y)(Xz-Xy-2X)
收錄日期: 2021-04-15 20:10:17
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110310000051KK01162