Maths 百分法
2015-05-11 12:35 am
回答 (3)
2015-05-11 1:40 am
✔ 最佳答案
7.设1月为x,即4月为x(1+12%)(1-5%)(1-5%)百分变化=[x(1+12%)(1-5%)(1-5%)-x]/x
=(1+12%)(1-5%)(1-5%)-1
=+1.08%
8.设某數为y
y(1-40%)(1+x%)=81___(1)
y(1-x%)(1+40%)=63___(2)
联立方程
y=81/[(1-40%)(1+x%)]__(3)put in to (2)
81(1-x%)(1+40%)/[(1-40%)(1+x%)]=63
81(1-x%)(1+40%)=63(1-40%)(1+x%)
113.4-1.134x=37.8+0.378x
1.512x=75.6
x=50
2015-08-06 8:27 pm
2015-05-11 12:59 am
I cant see the picture
收錄日期: 2021-04-15 20:08:30
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150510000051KK00055