30= -10+(100A÷y)
75= -15+(225A÷y)
求A.Y
maths求A and Y
2008-01-08 4:34 am
回答 (3)
2008-01-08 4:47 am
✔ 最佳答案
30 = -10 +(100A÷y)40 = 100A÷y
40Y =100A
A = (40Y÷100) <----1.
PUT 1. IN THE 2.
75 = -15+(225A÷y)
90 = 225(40Y÷100) ÷ Y
90Y = 9000Y÷100
90Y = 90Y
Y = 1
A = (40 X 1 ) ÷ 100
A = 0.4
不知道對不對-v-"
參考: me
2008-01-11 4:10 am
y不等於0
設y=r
A=2.5r
設y=r
A=2.5r
2008-01-09 7:19 am
30= -10+(100A÷y)....(i)
40=100A÷y
2=5A÷y
75= -15+(225A÷y)....(ii)
90=225A÷y
2=5A÷y
∴(i)=(ii)
∴A=2y/5, y=5A/2
沒有足夠數據求A, y的數值
40=100A÷y
2=5A÷y
75= -15+(225A÷y)....(ii)
90=225A÷y
2=5A÷y
∴(i)=(ii)
∴A=2y/5, y=5A/2
沒有足夠數據求A, y的數值
收錄日期: 2021-04-20 20:01:11
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https://hk.answers.yahoo.com/question/index?qid=20080107000051KK03563