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Pertanyaan

Nilai dari lo g 30 − 48 lo g 10 1 ​ + 16 lo g 10 1 ​ adalah ....

Nilai dari  adalah ....

  1. negative 2

  2. negative 1 

  3. 1 

  4. 2 

  5. 3 

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R. Rohmat

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Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah C.

jawaban yang tepat adalah C.

Pembahasan

Ingat sifat logaritma berikut! dengan dan dengan dan dengan dan Perhatikan perhitungan berikut! Dengan demikian, nilai dari adalah 1. Jadi, jawaban yang tepat adalah C.

Ingat sifat logaritma berikut!

table attributes columnalign right center left columnspacing 0px end attributes row cell log presuperscript a b end cell equals cell fraction numerator 1 over denominator log presuperscript b a end fraction comma end cell end table dengan table attributes columnalign right center left columnspacing 0px end attributes row blank blank a end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank b end table table attributes columnalign right center left columnspacing 0px end attributes row blank greater than blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 0 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank a end table table attributes columnalign right center left columnspacing 0px end attributes row blank not equal to blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 1 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table dan table attributes columnalign right center left columnspacing 0px end attributes row blank blank b end table table attributes columnalign right center left columnspacing 0px end attributes row blank not equal to blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 1 end table

log presuperscript a table attributes columnalign right center left columnspacing 0px end attributes row blank blank b end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank plus end table scriptbase table attributes columnalign right center left columnspacing 0px end attributes row blank blank log end table end scriptbase presuperscript a table attributes columnalign right center left columnspacing 0px end attributes row blank blank c end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table log presuperscript a table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell open parentheses b times c close parentheses end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table dengan table attributes columnalign right center left columnspacing 0px end attributes row blank blank a end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell space b end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell comma space end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank c end table table attributes columnalign right center left columnspacing 0px end attributes row blank greater than blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 0 end table dan table attributes columnalign right center left columnspacing 0px end attributes row blank blank a end table table attributes columnalign right center left columnspacing 0px end attributes row blank not equal to blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 1 end table

Error converting from MathML to accessible text. dengan table attributes columnalign right center left columnspacing 0px end attributes row blank blank a end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell space b end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell comma space end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank c end table table attributes columnalign right center left columnspacing 0px end attributes row blank greater than blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 0 end table dan table attributes columnalign right center left columnspacing 0px end attributes row blank blank a end table table attributes columnalign right center left columnspacing 0px end attributes row blank not equal to blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 1 end table

Perhatikan perhitungan berikut!

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell log invisible function application 30 minus fraction numerator 1 over denominator blank to the power of 48 log invisible function application 10 end fraction plus fraction numerator 1 over denominator blank to the power of 16 log invisible function application 10 end fraction end cell equals cell log invisible function application 30 minus to the power of 10 log invisible function application 48 plus to the power of 10 log invisible function application 16 end cell row blank equals cell log invisible function application 30 minus log invisible function application 48 plus log invisible function application 16 end cell row blank equals cell log invisible function application fraction numerator open parentheses 30 close parentheses open parentheses 16 close parentheses over denominator open parentheses 48 close parentheses end fraction end cell row blank equals cell log invisible function application 10 end cell row blank equals 1 end table end style

Dengan demikian, nilai dari log invisible function application 30 minus fraction numerator 1 over denominator log presuperscript 48 invisible function application 10 end fraction plus fraction numerator 1 over denominator log presuperscript 16 invisible function application 10 end fraction adalah 1.

Jadi, jawaban yang tepat adalah C.

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