數學題 about%

2007-07-19 9:51 pm
朱古力蛋糕一盒,9折較7折貴320元,求價錢?

回答 (3)

2007-07-19 9:58 pm
✔ 最佳答案
朱 x 90% - $320 = 朱 x 70%
90%x - 320 = 70%x
90%x-70%x=320
(90%-70%)x=320
20%x=320
x=320 / 20%
x = 320/
x = 1600
朱古力 = 1600
2007-07-19 10:07 pm
Let 一盒朱古力蛋糕 be $x

9折朱古力蛋糕 = 0.9x
7折朱古力蛋糕 = 0.7x

0.9x-0.7x = $320
0.2x = $320
x = $320/0.2
x = $1600

一盒朱古力蛋糕 is $1600
參考: me
2007-07-19 9:55 pm
320 / 0.2 = 1600

1600*0.9 = 1440
1600*0.7 = 1120


收錄日期: 2021-04-18 22:42:30
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070719000051KK02068

檢視 Wayback Machine 備份