Jawabanmu

2014-06-22T21:46:50+07:00
1. b.  \frac{1}{81}  =  3^{-4}
        81^{-1} =  3^{-4}
        3^{-4} =  3^{-4}
        3_{log 3^{-4} } = -4

2.a.  3_{log 4} = x
        3^{x} = 4
   b.  2_{log a} = 5
        2^{5} = a
3b. log 3 + log 4 +log \frac{5}{3} - log 2
      log  \frac{3.4. \frac{5}{3} }{2}
       log 10

4.a.  2_{log 45} + 2_{log 72}  -  2_{log 81}
        2_{log  \frac{45.72}{81} } =  2_{log 40}

5.  x_{log 8} +  x_{log4}  -  x_{log 2} =2
 x_{log  \frac{8.4}{2} } = 2
 x_{log 16} = 2
 x^{2} = 16
x=4


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