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Pertanyaan

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 : n. Maka m - n = ....

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 m - n =  ....

  1. begin mathsize 14px style 5 over 4 end style

  2. begin mathsize 14px style 7 over 2 end style

  3. begin mathsize 14px style 9 over 4 end style

  4. begin mathsize 14px style 3 over 2 end style

  5. begin mathsize 14px style 19 over 4 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 m = 2n - 1, 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 5 p with rightwards arrow on top plus 2 p with rightwards arrow on top end cell row blank equals cell 7 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 q with rightwards arrow on top plus q with rightwards arrow on top end cell row blank equals cell 2 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 2 q with rightwards arrow on top plus m times 5 p with rightwards arrow on top over denominator 1 plus m end fraction stack O E with rightwards arrow on top equals fraction numerator 2 q with rightwards arrow on top plus 5 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 q with rightwards arrow on top plus n times 7 p with rightwards arrow on top over denominator 1 plus n end fraction stack O E with rightwards arrow on top equals fraction numerator q with rightwards arrow on top plus 7 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 2 q with rightwards arrow on top plus 5 m p with rightwards arrow on top over denominator 1 plus m end fraction end cell equals cell fraction numerator q with rightwards arrow on top plus 7 n p with rightwards arrow on top over denominator 1 plus n end fraction end cell row cell fraction numerator 2 over denominator 1 plus m end fraction q with rightwards arrow on top plus fraction numerator 5 m over denominator 1 plus m end fraction p with rightwards arrow on top end cell equals cell fraction numerator 1 over denominator 1 plus n end fraction q with rightwards arrow on top plus fraction numerator 7 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 2 over denominator 1 plus m end fraction equals fraction numerator 1 over denominator 1 plus n end fraction end style

dan

begin mathsize 14px style fraction numerator 5 m over denominator 1 plus m end fraction equals fraction numerator 7 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 2 over denominator 1 plus m end fraction end cell equals cell fraction numerator 1 over denominator 1 plus n end fraction end cell row cell 2 open parentheses 1 plus n close parentheses end cell equals cell 1 plus m end cell row cell 2 plus 2 n end cell equals cell 1 plus m end cell row 0 equals cell open parentheses 1 plus m close parentheses minus open parentheses 2 plus 2 n close parentheses end cell row 0 equals cell 1 plus m minus 2 minus 2 n end cell row 0 equals cell m minus 2 n minus 1 end cell row m equals cell 2 n plus 1 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 5 m over denominator 1 plus m end fraction end cell equals cell fraction numerator 7 n over denominator 1 plus n end fraction end cell row cell 5 m open parentheses 1 plus n close parentheses end cell equals cell 7 n open parentheses 1 plus m close parentheses end cell row cell 5 m plus 5 m n end cell equals cell 7 n plus 7 m n end cell row 0 equals cell open parentheses 7 n plus 7 m n close parentheses minus open parentheses 5 m plus 5 m n close parentheses end cell row 0 equals cell 7 n plus 7 m n minus 5 m minus 5 m n end cell row 0 equals cell 2 m n minus 5 m plus 7 n end cell end table end style

Karena m = 2n - 1, maka

begin mathsize 14px style 0 equals 2 open parentheses 2 n plus 1 close parentheses n minus 5 open parentheses 2 n plus 1 close parentheses plus 7 n 0 equals 4 n squared plus 2 n minus 10 n minus 5 plus 7 n 0 equals 4 n squared minus n minus 5 0 equals open parentheses 4 n minus 5 close parentheses open parentheses n plus 1 close parentheses n equals 5 over 4 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 5 over 4 end style.

Maka

begin mathsize 14px style m equals 2 n plus 1 m equals 2 open parentheses 5 over 4 close parentheses plus 1 m equals 5 over 2 plus 1 m equals 7 over 2 end style

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell m minus n end cell equals cell 7 over 2 minus 5 over 4 end cell row blank equals cell 14 over 4 minus 5 over 4 end cell row blank equals cell 9 over 4 end cell end table end style

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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 ...

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