回复：对了，我还把你给的那个公式告诉了朋友：

jinjing 2010-01-11 11:20:47 ( reads)

Should be:

5=ln(sqt(exp(exp(ln2/log2))).

But 5=2/.2 is best the answer is from Commendate'

.2=2/5, 2/.2=2/(2/5)=2*5/2=5.