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Pertanyaan

Diketahui PQRS adalah suatu persegi panjang. M adalah titik tengah PQ dan N membagi SM dengan perbandingan 2 : 1 . Jika PQ ​ mewakili vektor a dan PS mewakili vektor b , nyatakan vektor yang diwakili oleh PN dalam dan .

Diketahui  adalah suatu persegi panjang.  adalah titik tengah  dan  membagi  dengan perbandingan . Jika  mewakili vektor  dan  mewakili vektor , nyatakan vektor yang diwakili oleh  dalam begin mathsize 14px style a with rightwards arrow on top end style dan begin mathsize 14px style b with rightwards arrow on top end style.

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W. Lestari

Master Teacher

Mahasiswa/Alumni Universitas Sriwijaya

Jawaban terverifikasi

Jawaban

.

 table attributes columnalign right center left columnspacing 0px end attributes row cell stack P N with rightwards arrow on top end cell equals cell 1 third a with rightwards arrow on top plus 1 third b with rightwards arrow on top end cell end table.

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Pembahasan

Diperhatikan bahwa searah dengan , namun panjangnya hanya setengah dari panjang , sehingga . berlawanan arah dengan , sehingga . . sehingga Jadi, .

Diperhatikan bahwa

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell stack P N with rightwards arrow on top end cell equals cell stack P M with rightwards arrow on top plus stack M N with rightwards arrow on top end cell row blank equals cell stack P M with rightwards arrow on top plus 1 third stack M S with rightwards arrow on top end cell row blank equals cell stack P M with rightwards arrow on top plus 1 third open parentheses stack M P with rightwards arrow on top plus stack P S with rightwards arrow on top close parentheses end cell end table end style 

  • begin mathsize 14px style stack P M with rightwards arrow on top end style searah dengan begin mathsize 14px style stack P Q with rightwards arrow on top end style, namun panjangnya hanya setengah dari panjang begin mathsize 14px style stack P Q with rightwards arrow on top end style, sehingga begin mathsize 14px style stack P M with rightwards arrow on top equals 1 half stack P Q with rightwards arrow on top equals 1 half a with rightwards arrow on top end style.
  • begin mathsize 14px style stack M P with rightwards arrow on top end style berlawanan arah dengan begin mathsize 14px style stack P M with rightwards arrow on top end style, sehingga begin mathsize 14px style stack M P with rightwards arrow on top equals negative a with rightwards arrow on top end style.
  • begin mathsize 14px style stack P S with rightwards arrow on top equals b with rightwards arrow on top end style.

sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell stack P N with rightwards arrow on top end cell equals cell stack P M with rightwards arrow on top plus 1 third left parenthesis stack M P with rightwards arrow on top plus stack P S with rightwards arrow on top right parenthesis end cell row blank equals cell 1 half a with rightwards arrow on top plus 1 third open parentheses negative 1 half a with rightwards arrow on top plus b with rightwards arrow on top close parentheses end cell row blank equals cell 1 third a with rightwards arrow on top plus 1 third b with rightwards arrow on top end cell end table end style 

Jadi, table attributes columnalign right center left columnspacing 0px end attributes row cell stack P N with rightwards arrow on top end cell equals cell 1 third a with rightwards arrow on top plus 1 third b with rightwards arrow on top end cell end table.

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