60=400/3^0.2(d) 求d?

2016-02-10 10:56 am

回答 (1)

2016-02-10 11:09 am

✔ 最佳答案

60 = 400/3^(0.2d) =>
3^(0.2d) = 400/60 =>
(0.2d)log3 = log(20/3) =>
0.2d = log(20/3)/(log3) =>
d = [log(20/3)/(log3)]/0.2

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