若A比B輕20%,則B比A重百分之幾？
要步驟
maths
2007-11-28 12:43 am
回答 (3)
2007-11-28 12:48 am
✔ 最佳答案
若A比B輕20%,則B比A重百分之幾？A=(1-0.2)B
A=0.8B
A/0.8=B
B=1.25A
因為B是A的1.25倍
所以B比A重百分之二十五
2007-11-28 4:21 am
A比B輕20%,即A=80%B
(100-80)/80x100%
=20/80x100%
=1/4x100%
=25%
(100-80)/80x100%
=20/80x100%
=1/4x100%
=25%
2007-11-28 12:51 am
設a為10
則bx100-20%=10
即bx80%=10
b=12.5
(b-a)/ax100%=
(12.5-10)/10x100%=
2.5/10x100%=25%
則bx100-20%=10
即bx80%=10
b=12.5
(b-a)/ax100%=
(12.5-10)/10x100%=
2.5/10x100%=25%
收錄日期: 2021-04-23 20:32:22
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071127000051KK01787