dear cma,81is not good.

来源: jinjing 于 2012-01-02 16:54:15 [档案] [旧帖] [给我悄悄话] 本文已被阅读：次 (266 bytes)

回答: 回复：If it is from Ps Q, We can do like that 由 cma 于 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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