２xy+6ab
________
20mn
請問可唔可以約同點樣約?
一d數學既野
2006-12-30 10:46 pm
回答 (5)
2006-12-30 10:51 pm
✔ 最佳答案
可以約~(2xy+6ab)/20mn
=2(xy+3ab)/2(10mn) ...................(factorization)
=(xy+3ab)/10mn//
注意: 凡係約數都要成個分子約(e.g.２xy+6ab), 唔可以淨係約一個數(e.g. 2xy)
否則就會計錯!!!
參考: me~
2006-12-30 11:16 pm
唔可以
如果要約
first, 要factorize (２xy+6ab)
(２xy+6ab) = 2( xy + 3ab )
２xy+6ab
________
20mn
=
2( xy + 3ab )
________
20mn
= ( xy + 3ab )
________
10mn
如果要約
first, 要factorize (２xy+6ab)
(２xy+6ab) = 2( xy + 3ab )
２xy+6ab
________
20mn
=
2( xy + 3ab )
________
20mn
= ( xy + 3ab )
________
10mn
2006-12-30 10:49 pm
2同20 6同20約
2006-12-30 10:49 pm
２ｘｙ＋６ａｂ
－－－－－－－
２０ｍｎ
２（ｘｙ＋３ａｂ）
＝－－－－－－－－
２（１０ｍｎ）
２約左佢～就變成～
ｘｙ＋３ａｂ
＝－－－－－－
１０ｍｎ
－－－－－－－
２０ｍｎ
２（ｘｙ＋３ａｂ）
＝－－－－－－－－
２（１０ｍｎ）
２約左佢～就變成～
ｘｙ＋３ａｂ
＝－－－－－－
１０ｍｎ
2006-12-30 10:49 pm
抽個2出黎約~
= [ (2) (xy + 3ab) ] / (2) (10mn)
= (xy + 3ab) / 10mn
= [ (2) (xy + 3ab) ] / (2) (10mn)
= (xy + 3ab) / 10mn
收錄日期: 2021-04-13 13:30:55
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061230000051KK01937