楼主真聪明,懂得举一反三.的确如此.其实你可以用windows自带的计算器试一下：ln2=0.69314718055994530941723212145818
ln5=1.6094379124341003746007593332262
ln2+ln5=2.3025850929940456840179914546842
ln10=2.3025850929940456840179914546844