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Jika 5 lo g 3 = a dan 3 lo g 4 = b , tentukan nilai dari 12 lo g 75 !

Jika  dan , tentukan nilai dari 

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nilai dari adalah .

nilai dari begin mathsize 14px style log presuperscript 12 space 75 end style adalah begin mathsize 14px style fraction numerator a plus 2 over denominator a plus a b end fraction end style.

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Diketahui: dan Perhatikan perhitungan berikut. Jadi, nilai dari adalah .

Diketahui:

begin mathsize 14px style log presuperscript 5 space 3 equals a end style dan begin mathsize 14px style log presuperscript 3 space 4 equals b space end style

Perhatikan perhitungan berikut.

begin mathsize 14px style table attributes columnalign right center left columnspacing 2px end attributes row cell log presuperscript 12 space 75 end cell equals cell fraction numerator log presuperscript 3 space 75 over denominator log presuperscript 3 space 12 end fraction end cell row blank equals cell fraction numerator log presuperscript 3 space open parentheses 3 times 5 squared close parentheses over denominator log presuperscript 3 space open parentheses 3 times 4 close parentheses end fraction end cell row blank equals cell fraction numerator log presuperscript 3 space 3 plus log presuperscript 3 space 5 squared over denominator log presuperscript 3 space 3 plus log presuperscript 3 space 4 end fraction end cell row blank equals cell fraction numerator log presuperscript 3 space 3 plus 2 times log presuperscript 3 space 5 over denominator log presuperscript 3 space 3 plus log presuperscript 3 space 4 end fraction end cell row blank equals cell fraction numerator log presuperscript 3 space 3 plus 2 times begin display style fraction numerator 1 over denominator log presuperscript 5 space 3 end fraction end style over denominator log presuperscript 3 space 3 plus log presuperscript 3 space 4 end fraction end cell row blank equals cell fraction numerator 1 plus 2 times begin display style 1 over a end style over denominator 1 plus b end fraction end cell row blank equals cell fraction numerator 1 plus begin display style 2 over a end style over denominator 1 plus b end fraction end cell row blank equals cell fraction numerator begin display style fraction numerator a plus 2 over denominator a end fraction end style over denominator 1 plus b end fraction end cell row blank equals cell fraction numerator a plus 2 over denominator a end fraction cross times fraction numerator 1 over denominator 1 plus b end fraction end cell row blank equals cell fraction numerator a plus 2 over denominator a plus a b end fraction end cell end table end style 

Jadi, nilai dari begin mathsize 14px style log presuperscript 12 space 75 end style adalah begin mathsize 14px style fraction numerator a plus 2 over denominator a plus a b end fraction end style.

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