maths問題~~10分

2008-04-17 7:19 am
(x+2000) * (D/x) - D = 10000
求D/x=?
更新1:

注意: *係代表乘

更新2:

我唔太明呢個step~ D((x+2000)/x-1) = 10000

更新3:

哦.. 我明啦~ thx~

回答 (1)

2008-04-17 7:22 am
✔ 最佳答案
(x+2000) * (D/x) - D = 10000
D((x+2000)/x-1) = 10000
D((x+2000-x)/x)=10000
D(2000/x) = 10000
D = 5x

2008-04-16 23:23:02 補充:
D/x = 5


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