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Hasil dari 3 lo g 27 3 ​ 2 lo g 8 1 ​ + 5 lo g 7 ​ × 7 lo g 5 1 ​ ​ adalah ...

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Ingatlah sifat-sifat pada logaritma berikut: Sehingga diperoleh: Maka, hasil dari adalah .

Ingatlah sifat-sifat pada logaritma berikut:

table attributes columnalign left center left end attributes row cell scriptbase log space straight a end scriptbase presuperscript straight a end cell equals 1 row cell scriptbase log space straight b times scriptbase log space straight c end scriptbase presuperscript straight b end scriptbase presuperscript straight a end cell equals cell scriptbase log space straight c end scriptbase presuperscript straight a end cell end table

Sehingga diperoleh:

table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator log presuperscript 2 begin display style 1 over 8 end style plus scriptbase log square root of 7 cross times end scriptbase presuperscript 5 log presuperscript 7 begin display style 1 fifth end style over denominator scriptbase log space 27 square root of 3 end scriptbase presuperscript 3 end fraction end cell equals cell fraction numerator log presuperscript 2 begin display style 1 over 2 cubed end style plus log presuperscript 5 space 7 to the power of begin display style 1 half end style end exponent cross times log presuperscript 7 begin display style 1 fifth end style over denominator log presuperscript 3 space 3 cubed cross times 3 to the power of begin display style 1 half end style end exponent end fraction end cell row blank equals cell fraction numerator log presuperscript 2 space 2 to the power of negative 3 end exponent plus log presuperscript 5 space 7 to the power of 1 half end exponent cross times log presuperscript 7 space 5 to the power of negative 1 end exponent over denominator log presuperscript 3 space 3 to the power of 3 plus begin display style 1 half end style end exponent end fraction end cell row blank equals cell fraction numerator negative 3 plus open parentheses begin display style 1 half end style cross times negative 1 close parentheses over denominator begin display style 6 over 2 end style plus begin display style 1 half end style end fraction end cell row blank equals cell fraction numerator negative 3 plus open parentheses negative begin display style 1 half end style close parentheses over denominator begin display style 7 over 2 end style end fraction end cell row blank equals cell fraction numerator negative 3 minus begin display style 1 half end style over denominator begin display style 7 over 2 end style end fraction end cell row blank equals cell fraction numerator negative begin display style 6 over 2 end style minus begin display style 1 half end style over denominator begin display style 7 over 2 end style end fraction end cell row blank equals cell negative 7 over 2 cross times 2 over 7 end cell row blank equals cell negative 1 end cell end table

Maka, hasil dari fraction numerator log presuperscript 2 begin display style 1 over 8 end style plus scriptbase log square root of 7 cross times end scriptbase presuperscript 5 scriptbase log begin display style 1 fifth end style end scriptbase presuperscript 7 over denominator scriptbase log space 27 square root of 3 end scriptbase presuperscript 3 end fraction adalah negative 1.

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