Jawabanmu

2014-09-08T22:39:20+07:00
2log 15 =2log(3.5)=2log 3 + 2log 5 = a+b
4log75 = 4log( 25 x 3) = 4log 5 + 4log 5 \frac{1}{ 5_{log4} } + \frac{1}{ 5_{log4} } + \frac{1}{ 3_{log4} }=\frac{1}{ 5_{log2}+ 5_{log2}  } +\frac{1}{ 5_{log2}+ 5_{log2}  } +\frac{1}{ 3_{log2}+ 3_{log2}  }

 2_{log 3} . 3_{log 5} =  2_{log 5}=a . b   .....  5_{log2}= \frac{1}{ab}

hasilnya =  2 \frac{1}{ \frac{1}{a . b}+ \frac{1}{a. b} }+  \frac{1}{ \frac{1}{a} + \frac{1}{a}}