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Pertanyaan

Perhatikan gambar berikut ini Diketahui bahwa O A = 3 p ​ , A B = 2 p ​ , OC = 2 q ​ , dan C D = 3 q ​ . Titik E merupakan titik potong AD dan BC sedemikian sehingga AE : ED = 1 : m dan BE : EC = 1 : n. Maka n m ​ = ....

Perhatikan gambar berikut ini

Diketahui bahwa , , , dan . Titik E merupakan titik potong AD dan BC sedemikian sehingga AE : ED = 1 : m dan BE : EC = 1 : n. Maka ....

  1. begin mathsize 14px style 93 over 20 end style

  2. begin mathsize 14px style 25 over 6 end style

  3. begin mathsize 14px style 27 over 8 end style

  4. begin mathsize 14px style 57 over 20 end style

  5. begin mathsize 14px style 12 over 7 end style 

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Jawaban terverifikasi

Pembahasan

Perhatikan bahwa dan Perhatikan gambar berikut Karena AE : ED = 1 : m, maka Selanjutnya karena BE : EC = 1 : n, maka Sehingga Didapat bahwa dan Sehingga dan Karena , maka Perhatikan bahwa BE : EC = 1 : n. Karena panjang BE dan EC tidak mungkin negatif, maka nilai n haruslah positif. Sehingga dipilih . Maka Sehingga

Perhatikan bahwa

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell stack O B with rightwards arrow on top end cell equals cell stack O A with rightwards arrow on top plus stack A B with rightwards arrow on top end cell row blank equals cell 3 p with rightwards arrow on top plus 2 p with rightwards arrow on top end cell row blank equals cell 5 p with rightwards arrow on top end cell end table end style

dan

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 C with rightwards arrow on top plus stack C D with rightwards arrow on top end cell row blank equals cell 2 q with rightwards arrow on top plus 3 q with rightwards arrow on top end cell row blank equals cell 5 q with rightwards arrow on top end cell end table end style

Perhatikan gambar berikut

Karena AE : ED = 1 : m, maka

begin mathsize 14px style stack O E with rightwards arrow on top equals fraction numerator stack O D with rightwards arrow on top plus m times stack O A with rightwards arrow on top over denominator 1 plus m end fraction stack O E with rightwards arrow on top equals fraction numerator 5 q with rightwards arrow on top plus m times 3 p with rightwards arrow on top over denominator 1 plus m end fraction stack O E with rightwards arrow on top equals fraction numerator 5 q with rightwards arrow on top plus 3 m p with rightwards arrow on top over denominator 1 plus m end fraction end style

Selanjutnya karena BE : EC = 1 : n, maka

begin mathsize 14px style stack O E with rightwards arrow on top equals fraction numerator stack O C with rightwards arrow on top plus n times stack O B with rightwards arrow on top over denominator 1 plus n end fraction stack O E with rightwards arrow on top equals fraction numerator 2 q with rightwards arrow on top plus n times 5 p with rightwards arrow on top over denominator 1 plus n end fraction stack O E with rightwards arrow on top equals fraction numerator 2 q with rightwards arrow on top plus 5 n p with rightwards arrow on top over denominator 1 plus n end fraction end style

Sehingga

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 stack O E with rightwards arrow on top end cell row cell fraction numerator 5 q with rightwards arrow on top plus 3 m p with rightwards arrow on top over denominator 1 plus m end fraction end cell equals cell fraction numerator 2 q with rightwards arrow on top plus 5 n p with rightwards arrow on top over denominator 1 plus n end fraction end cell row cell fraction numerator 5 over denominator 1 plus m end fraction q with rightwards arrow on top plus fraction numerator 3 m over denominator 1 plus m end fraction p with rightwards arrow on top end cell equals cell fraction numerator 2 over denominator 1 plus n end fraction q with rightwards arrow on top plus fraction numerator 5 n over denominator 1 plus n end fraction p with rightwards arrow on top end cell end table end style

Didapat bahwa

begin mathsize 14px style fraction numerator 5 over denominator 1 plus m end fraction equals fraction numerator 2 over denominator 1 plus n end fraction end style

dan

begin mathsize 14px style fraction numerator 3 m over denominator 1 plus m end fraction equals fraction numerator 5 n over denominator 1 plus n end fraction end style

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator 5 over denominator 1 plus m end fraction end cell equals cell fraction numerator 2 over denominator 1 plus n end fraction end cell row cell 5 open parentheses 1 plus n close parentheses end cell equals cell 2 open parentheses 1 plus m close parentheses end cell row cell 5 plus 5 n end cell equals cell 2 plus 2 m end cell row 0 equals cell open parentheses 2 plus 2 m close parentheses minus open parentheses 5 plus 5 n close parentheses end cell row 0 equals cell 2 plus 2 m minus 5 minus 5 n end cell row 0 equals cell 2 m minus 5 n minus 3 end cell row cell 2 m end cell equals cell 5 n plus 3 end cell row m equals cell 1 half open parentheses 5 n plus 3 close parentheses end cell end table end style

dan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator 3 m over denominator 1 plus m end fraction end cell equals cell fraction numerator 5 n over denominator 1 plus n end fraction end cell row cell 3 m open parentheses 1 plus n close parentheses end cell equals cell 5 n open parentheses 1 plus m close parentheses end cell row cell 3 m plus 3 m n end cell equals cell 5 n plus 5 m n end cell row 0 equals cell open parentheses 5 n plus 5 m n close parentheses minus open parentheses 3 m plus 3 m n close parentheses end cell row 0 equals cell 5 n plus 5 m n minus 3 m minus 3 m n end cell row 0 equals cell 2 m n minus 3 m plus 5 n end cell end table end style

Karena begin mathsize 14px style m equals 1 half open parentheses 5 n plus 3 close parentheses end style, maka

begin mathsize 14px style 0 equals 2 open parentheses 1 half open parentheses 5 n plus 3 close parentheses close parentheses n minus 3 over 2 open parentheses 5 n plus 3 close parentheses plus 5 n 0 equals open parentheses 5 n plus 3 close parentheses n minus 3 over 2 open parentheses 5 n plus 3 close parentheses plus 5 n 0 equals 5 n squared plus 3 n minus 15 over 2 n minus 9 over 2 plus 5 n 0 equals 10 n squared plus 6 n minus 15 n minus 9 plus 10 n 0 equals 10 n squared plus n minus 9 0 equals open parentheses 10 n minus 9 close parentheses open parentheses n plus 1 close parentheses n equals 9 over 10 text  atau  end text n equals negative 1 end style

Perhatikan bahwa BE : EC = 1 : n. Karena panjang BE dan EC tidak mungkin negatif, maka nilai n haruslah positif.

Sehingga dipilih begin mathsize 14px style n equals 9 over 10 end style.

Maka

begin mathsize 14px style m equals 1 half open parentheses 5 n plus 3 close parentheses m equals 1 half open parentheses 5 open parentheses 9 over 10 close parentheses plus 3 close parentheses m equals 1 half open parentheses 9 over 2 plus 3 close parentheses m equals 1 half open parentheses 15 over 2 close parentheses m equals 15 over 4 end style

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell m over n end cell equals cell fraction numerator 15 over 4 over denominator 9 over 10 end fraction end cell row blank equals cell 15 over 4 cross times 10 over 9 end cell row blank equals cell 150 over 36 end cell row blank equals cell 25 over 6 end cell end table end style

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Perhatikan gambar berikut ini Diketahui bahwa O A = 5 p ​ , A B = 2 p ​ , OC = q ​ , dan C D = q ​ . Titik E merupakan titik potong AD dan BC sedemikian sehingga AE : ED = 1 : m dan BE : EC = 1 ...

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