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Pertanyaan

Perhatikan gambar berikut Diketahui O A = 3 p ​ dan OB = 6 q ​ . Titik C merupakan titik tengah OB dan titik D berada pada AB sedemikian sehingga BD = 2DA. Maka OE = ...

Perhatikan gambar berikut

Diketahui dan . Titik C merupakan titik tengah OB dan titik D berada pada AB sedemikian sehingga BD = 2DA. Maka = ...

  1. begin mathsize 14px style 1 half open parentheses p with rightwards arrow on top plus q with rightwards arrow on top close parentheses end style

  2. begin mathsize 14px style p with rightwards arrow on top plus q with rightwards arrow on top end style

  3. begin mathsize 14px style 3 over 4 open parentheses p with rightwards arrow on top plus q with rightwards arrow on top close parentheses end style

  4. begin mathsize 14px style 3 over 2 open parentheses p with rightwards arrow on top plus q with rightwards arrow on top close parentheses end style

  5. begin mathsize 14px style 2 open parentheses p with rightwards arrow on top plus q with rightwards arrow on top close parentheses end style

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Jawaban terverifikasi

Pembahasan

Perhatikan bahwa Karena BD = 2DA dan searah dan sejajar dengan vektor , maka Kemudian Sehingga Karena C adalah titik tengah OB, maka Perhatikan bahwa A, E, dan C terletak segaris. Misalkan AE : EC = m : n, maka Karena O, E, dan D terletak segaris, maka Sehingga Maka Sehingga Maka

Perhatikan bahwa

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell stack A B with rightwards arrow on top end cell equals cell stack O B with rightwards arrow on top minus stack O A with rightwards arrow on top end cell row blank equals cell 6 q with rightwards arrow on top minus 3 p with rightwards arrow on top end cell end table end style

Karena BD = 2DA dan begin mathsize 14px style stack B D with rightwards arrow on top end style searah dan sejajar dengan vektor begin mathsize 14px style stack D A with rightwards arrow on top end style, maka

begin mathsize 14px style stack B D with rightwards arrow on top equals 2 stack D A with rightwards arrow on top end style

Kemudian

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell stack B A with rightwards arrow on top end cell equals cell stack B D with rightwards arrow on top plus stack D A with rightwards arrow on top end cell row cell negative stack A B with rightwards arrow on top end cell equals cell 2 stack D A with rightwards arrow on top plus stack D A with rightwards arrow on top end cell row cell negative open parentheses 6 q with rightwards arrow on top minus 3 p with rightwards arrow on top close parentheses end cell equals cell 3 stack D A with rightwards arrow on top end cell row cell 3 p with rightwards arrow on top minus 6 q with rightwards arrow on top end cell equals cell 3 stack D A with rightwards arrow on top end cell row cell stack D A with rightwards arrow on top end cell equals cell p with rightwards arrow on top minus 2 q with rightwards arrow on top end cell end table end style

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell stack O D with rightwards arrow on top end cell equals cell stack O A with rightwards arrow on top plus stack A D with rightwards arrow on top end cell row blank equals cell stack O A with rightwards arrow on top plus open parentheses negative stack D A with rightwards arrow on top close parentheses end cell row blank equals cell stack O A with rightwards arrow on top minus stack D A with rightwards arrow on top end cell row blank equals cell 3 p with rightwards arrow on top minus open parentheses p with rightwards arrow on top minus 2 q with rightwards arrow on top close parentheses end cell row blank equals cell 3 p with rightwards arrow on top minus p with rightwards arrow on top plus 2 q with rightwards arrow on top end cell row blank equals cell 2 p with rightwards arrow on top plus 2 q with rightwards arrow on top end cell end table end style

Karena C adalah titik tengah OB, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell stack O C with rightwards arrow on top end cell equals cell 1 half stack O B with rightwards arrow on top end cell row blank equals cell 1 half open parentheses 6 q with rightwards arrow on top close parentheses end cell row blank equals cell 3 q with rightwards arrow on top end cell end table end style

Perhatikan bahwa A, E, dan C terletak segaris. Misalkan AE : EC = m : n, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell stack O E with rightwards arrow on top end cell equals cell fraction numerator m times stack O C with rightwards arrow on top plus n times stack O A with rightwards arrow on top over denominator m plus n end fraction end cell row blank equals cell fraction numerator m times 3 q with rightwards arrow on top plus n times 3 p with rightwards arrow on top over denominator m plus n end fraction end cell row blank equals cell fraction numerator 3 m q with rightwards arrow on top plus 3 n p with rightwards arrow on top over denominator m plus n end fraction end cell row blank equals cell fraction numerator 3 n p with rightwards arrow on top plus 3 m q with rightwards arrow on top over denominator m plus n end fraction end cell end table end style

Karena O, E, dan D terletak segaris, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell stack O E with rightwards arrow on top end cell equals cell k times stack O D with rightwards arrow on top end cell row cell fraction numerator 3 n p with rightwards arrow on top plus 3 m q with rightwards arrow on top over denominator m plus n end fraction end cell equals cell k times open parentheses 2 p with rightwards arrow on top plus 2 q with rightwards arrow on top close parentheses end cell row cell fraction numerator 3 n over denominator m plus n end fraction p with rightwards arrow on top plus fraction numerator 3 m over denominator m plus n end fraction q with rightwards arrow on top end cell equals cell 2 k p with rightwards arrow on top plus 2 k q with rightwards arrow on top end cell end table end style

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator 3 n over denominator m plus n end fraction end cell equals cell 2 k end cell row cell fraction numerator 3 m over denominator m plus n end fraction end cell equals cell 2 k end cell end table end style

Maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator 3 n over denominator m plus n end fraction minus fraction numerator 3 m over denominator m plus n end fraction end cell equals 0 row cell fraction numerator 3 n over denominator m plus n end fraction end cell equals cell fraction numerator 3 m over denominator m plus n end fraction end cell row n equals m end table end style

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator 3 n over denominator m plus n end fraction end cell equals cell 2 k end cell row cell fraction numerator 3 m over denominator m plus m end fraction end cell equals cell 2 k end cell row cell fraction numerator 3 m over denominator 2 m end fraction end cell equals cell 2 k end cell row cell 3 over 2 end cell equals cell 2 k end cell row k equals cell 3 over 4 end cell end table end style

Maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell stack O E with rightwards arrow on top end cell equals cell k times stack O D with rightwards arrow on top end cell row blank equals cell 3 over 4 times open parentheses 2 p with rightwards arrow on top plus 2 q with rightwards arrow on top close parentheses end cell row blank equals cell 3 over 2 p with rightwards arrow on top plus 3 over 2 q with rightwards arrow on top end cell row blank equals cell 3 over 2 open parentheses p with rightwards arrow on top plus q with rightwards arrow on top close parentheses end cell end table end style

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