7000×(1-y%)^2=4480
(有計算過程)
the % maths( one question only)20 marks quick!!!
2008-10-18 8:30 pm
回答 (1)
2008-10-18 8:53 pm
✔ 最佳答案
7000 (1 - y%)2 = 4480
(1 - y%)2 = 4480/7000
(1 - y%)2 = 0.64
(1 - y%) = √(0.64) ooro (1 - y%) = -√(0.64)
1 - y% = 0.8 ooro 1 - y% = -0.8
-y% = 0.8 - 1 ooro -y% = -0.8 - 1
-y% = -0.2 ooro -y% = -1.8
-y% = -20% ooro -y% = -180%
y = 20 ooro y = 180
If (1 - y%) is positive, reject the answer y = 180.
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收錄日期: 2021-04-23 23:07:07
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081018000051KK00817