1/a: 1/b :1/c = 2:3:5
則a:b:c = ????
請例算式as我唔明concept...thx
比例的數．．．唔識
2009-02-25 8:31 pm
回答 (2)
2009-02-25 8:53 pm
✔ 最佳答案
1/a : 1/b : 1/c = 2 : 3 : 51/(1/a) : 1/(1/b) : 1/(1/c) = 1/2 : 1/3 : 1/5
a : b : c = 1/2 : 1/3 : 1/5
a : b : c = 30/2 : 30/3 : 30/5
a :b : c = 15 : 10 : 6
參考: 我自己
2009-02-26 4:28 am
1/a:1/b=2:3
(1/a)/(1/b)=2/3
2/b=3/a
a:b=3:2
1/b:1/c=3:5
(1/b)/(1/c)=3/5
3/c=5/b
b:c=5:3
a:b =3:2__(*5)
_b:c=_5:3_(*2)
a:b:c=15:10:6
so,a:b:c=15:10:6
(1/a)/(1/b)=2/3
2/b=3/a
a:b=3:2
1/b:1/c=3:5
(1/b)/(1/c)=3/5
3/c=5/b
b:c=5:3
a:b =3:2__(*5)
_b:c=_5:3_(*2)
a:b:c=15:10:6
so,a:b:c=15:10:6
收錄日期: 2021-04-21 22:03:16
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090225000051KK00503