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Pertanyaan

Hasil dari 243 + 81 3 ​ + 81 + 27 3 ​ + 27 + 9 3 ​ + … adalah ....

Hasil dari  adalah ....

  1. begin mathsize 14px style 243 over 2 open parentheses 1 plus 1 third square root of 3 close parentheses end style 

  2. begin mathsize 14px style 533 over 2 open parentheses 1 plus 1 third square root of 3 close parentheses end style  

  3. begin mathsize 14px style 729 over 2 open parentheses 1 plus 1 third square root of 3 close parentheses end style  

  4. begin mathsize 14px style 81 open parentheses 1 plus 1 third square root of 3 close parentheses end style  

  5. begin mathsize 14px style 162 open parentheses 1 plus 1 third square root of 3 close parentheses end style  

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S. Suharni

Master Teacher

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah C.

jawaban yang tepat adalah C.

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Pembahasan

Diketahui dan ,maka Sehingga Oleh karena itu, . Jadi, jawaban yang tepat adalah C.

Diketahui begin mathsize 14px style straight a equals straight U subscript 1 equals 243 end style dan begin mathsize 14px style straight U subscript 2 equals 81 square root of 3 end style, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight r equals cell straight U subscript 2 over straight U subscript 1 end cell row blank equals cell fraction numerator 81 square root of 3 over denominator 243 end fraction end cell row blank equals cell 1 third square root of 3 end cell end table end style  

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight S subscript straight infinity end cell equals cell fraction numerator straight a over denominator 1 minus straight r end fraction end cell row blank equals cell fraction numerator 243 over denominator 1 minus 1 third square root of 3 end fraction end cell row blank equals cell fraction numerator 243 over denominator 1 minus 1 third square root of 3 end fraction cross times fraction numerator 1 plus 1 third square root of 3 over denominator 1 plus 1 third square root of 3 end fraction end cell row blank equals cell fraction numerator 243 open parentheses 1 plus 1 third square root of 3 close parentheses over denominator 1 squared minus open parentheses 1 third square root of 3 close parentheses squared end fraction end cell row blank equals cell fraction numerator 243 open parentheses 1 plus 1 third square root of 3 close parentheses over denominator 1 minus open parentheses 1 over 9 times 3 close parentheses end fraction end cell row blank equals cell fraction numerator 243 open parentheses 1 plus 1 third square root of 3 close parentheses over denominator 1 minus 1 third end fraction end cell row blank equals cell fraction numerator 243 open parentheses 1 plus 1 third square root of 3 close parentheses over denominator 2 over 3 end fraction end cell row blank equals cell 243 open parentheses 1 plus 1 third square root of 3 close parentheses times 3 over 2 end cell row blank equals cell 729 over 2 open parentheses 1 plus 1 third square root of 3 close parentheses end cell end table end style  

Oleh karena itu,

begin mathsize 14px style 243 plus 81 square root of 3 plus 81 plus 27 square root of 3 plus 27 plus 9 square root of 3 plus horizontal ellipsis equals 729 over 2 open parentheses 1 plus 1 third square root of 3 close parentheses end style.

Jadi, jawaban yang tepat adalah C.

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