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- 庭耀Lv 51 decade agoFavorite Answer
2(ln 8 − ln 4) = ln 4是對的

2(ln8-ln4)=2ln(84)=2ln2=ln2^2=ln4

其中用到ln a - ln b=ln (ab)

n ln a = ln a^n

2009-04-12 14:51:07 補充：

上面的除法都不見了

重貼一次

2(ln 8 − ln 4) = ln 4是對的

2(ln8-ln4)=2ln(8除以4)=2ln2=ln2^2=ln4

其中用到ln a - ln b=ln (a除以b)

n ln a = ln a^n

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