1.如果x比y多60%,y比x少百分之幾?
2.若A是B的70%,而C比A大30%,C是B的百分之幾?
要詳細列明步驟,,
thx
F.3百分法題
2007-12-25 10:40 pm
回答 (3)
2007-12-25 11:00 pm
✔ 最佳答案
1.x = 1.6y
y = 0.625x
y比x少(1-0.625)x100% = 37.5%
2.
A = 0.7B
A = 1.3C
1.3C = 0.7B
C = (0.7/1.3)B
C = 0.54B (四捨五入）
C是B的(0.54 X 100%) = 54%
2007-12-25 15:05:09 補充：
不好意思，第二題應該如下：2.A = 0.7B1.3A = CA = (1/1.3)C0.7B = (1/1.3)CC = 0.91BC是B的(0.91 X 100%) = 91%
參考: 自己
2007-12-25 10:47 pm
用百分增減,新-舊over舊x100%
2007-12-25 14:48:11 補充：
絕對唔係1樓果個就咁減=_=但係我唔記得左跟住點做,諗番後補充步驟..
2007-12-25 14:53:02 補充：
我記得啦,第1題160%y=x160%y-100%y over 160%y x100%=37.5%
2007-12-25 14:56:27 補充：
第2題70%b=a130%a=ca=c over 130%70%b=c over 130%91%b=cC=91%B
2007-12-25 14:57:17 補充：
重申一次唔係就咁減答案唔係40%同100%
2007-12-25 14:48:11 補充：
絕對唔係1樓果個就咁減=_=但係我唔記得左跟住點做,諗番後補充步驟..
2007-12-25 14:53:02 補充：
我記得啦,第1題160%y=x160%y-100%y over 160%y x100%=37.5%
2007-12-25 14:56:27 補充：
第2題70%b=a130%a=ca=c over 130%70%b=c over 130%91%b=cC=91%B
2007-12-25 14:57:17 補充：
重申一次唔係就咁減答案唔係40%同100%
收錄日期: 2021-04-25 22:21:04
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071225000051KK01675