緊急!!數學!!!! 10分!!!!
回答 (2)
2007-10-27 5:11 am
✔ 最佳答案
設$x 為他原來每星期的入息x(1 + 20%)(1 - 10%) = x + 320
x * 1.2 * 0.9 = x + 320
1.08 x = x + 320
(1.08 - 1) x = 320
0.08x = 320
x = 320 / 0.08 = 4000
小明原來每星期的入息為$4000
2007-10-27 5:12 am
(100%+20%)-{(100%-20%)x10%}
=120%-12%
=8%
$320/8%
=$40
$40x100
=4000
=120%-12%
=8%
$320/8%
=$40
$40x100
=4000
收錄日期: 2021-04-13 14:11:00
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071026000051KK03520