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Pertanyaan

Perhatikan gambar berikut ini Diketahui titik C merupakan titik tengah OB. Jika OB = p ​ , A B = q ​ , dan AC diperpanjang hingga D dengan AC : CD = 5 : 2, maka B D = ...

Perhatikan gambar berikut ini

 

Diketahui titik C merupakan titik tengah OB.

Jika , dan AC diperpanjang hingga D dengan AC : CD = 5 : 2, maka ...

  1. begin mathsize 14px style 1 over 10 open parentheses 3 p with rightwards arrow on top plus 7 q with rightwards arrow on top close parentheses end style

  2. begin mathsize 14px style 1 over 10 open parentheses negative 7 p with rightwards arrow on top plus 4 q with rightwards arrow on top close parentheses end style

  3. begin mathsize 14px style 1 over 10 open parentheses 3 p with rightwards arrow on top plus 4 q with rightwards arrow on top close parentheses end style

  4. begin mathsize 14px style 1 fifth open parentheses negative 7 p with rightwards arrow on top plus 4 q with rightwards arrow on top close parentheses end style

  5. begin mathsize 14px style 1 fifth open parentheses 3 p with rightwards arrow on top plus 4 q with rightwards arrow on top close parentheses end style 

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Pembahasan

Perhatikan bahwa Karena C berada di pertengahan OB, maka Kemudian A, C, dan D terletak segaris. Karena AC : CD = 5 : 2, maka Sehingga

Perhatikan bahwa

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

Karena C berada di pertengahan 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 p with rightwards arrow on top end cell end table end style

Kemudian A, C, dan D terletak segaris. Karena AC : CD = 5 : 2, 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 fraction numerator 5 stack O D with rightwards arrow on top plus 2 stack O A with rightwards arrow on top over denominator 5 plus 2 end fraction end cell row cell 1 half p with rightwards arrow on top end cell equals cell fraction numerator 5 stack O D with rightwards arrow on top plus 2 open parentheses p with rightwards arrow on top minus q with rightwards arrow on top close parentheses over denominator 7 end fraction end cell row cell 7 over 2 p with rightwards arrow on top end cell equals cell 5 stack O D with rightwards arrow on top plus 2 open parentheses p with rightwards arrow on top minus q with rightwards arrow on top close parentheses end cell row cell 7 over 2 p with rightwards arrow on top end cell equals cell 5 stack O D with rightwards arrow on top plus 2 p with rightwards arrow on top minus 2 q with rightwards arrow on top end cell row cell 7 over 2 p with rightwards arrow on top minus 2 p with rightwards arrow on top plus 2 q with rightwards arrow on top end cell equals cell 5 stack O D with rightwards arrow on top end cell row cell 3 over 2 p with rightwards arrow on top plus 2 q with rightwards arrow on top end cell equals cell 5 stack O D with rightwards arrow on top end cell row cell 1 half open parentheses 3 p with rightwards arrow on top plus 4 q with rightwards arrow on top close parentheses end cell equals cell 5 stack O D with rightwards arrow on top end cell row cell stack O D with rightwards arrow on top end cell equals cell 1 fifth times 1 half open parentheses 3 p with rightwards arrow on top plus 4 q with rightwards arrow on top close parentheses end cell row cell stack O D with rightwards arrow on top end cell equals cell 1 over 10 open parentheses 3 p with rightwards arrow on top plus 4 q with rightwards arrow on top close parentheses end cell end table end style

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell stack B D with rightwards arrow on top end cell equals cell stack O D with rightwards arrow on top minus stack O B with rightwards arrow on top equals 1 over 10 open parentheses 3 p with rightwards arrow on top plus 4 q with rightwards arrow on top close parentheses minus p with rightwards arrow on top end cell row blank equals cell 3 over 10 p with rightwards arrow on top plus 4 over 10 q with rightwards arrow on top minus p with rightwards arrow on top end cell row blank equals cell negative 7 over 10 p with rightwards arrow on top plus 4 over 10 q with rightwards arrow on top end cell row blank equals cell 1 over 10 open parentheses negative 7 p with rightwards arrow on top plus 4 q with rightwards arrow on top close parentheses end cell end table end style

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Vektor posisi A, B, dan C terhadap titik O secara berturut-turut adalah a = u + v + 2 w , b = 3 u + 4 v + w , dan c = 9 u + 13 v − 2 w . Jika titik A, B, dan C segaris, maka A B : BC adalah ....

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