dear cma,81is not good.

來源: jinjing 於 2012-01-02 16:54:15 [] [舊帖] [給我悄悄話] 閱讀數 : (266 bytes)
回答: 回複：If it is from Ps Q, We can do like that 由 cma 於 2012-01-02 13:48:33

If b=2d,a=20.we get anwser no err.It is 72,71 or 70. If using your formula we get

81.It is not right.A formula should be right in their domain.the  (90-a)/b is getting in

times,out is almost the same, so we have 2(90-a)/b times as the ...

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