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Diketahui △ ABC , P membagi AB dengan AP : PB = 2 : 1 dan Q titik tengah AC. Jika CA ⇀ = u ⇀ dan CB ⇀ = v ⇀ , maka PQ ⇀ ​ = ...

Diketahui , P membagi AB dengan  dan Q titik tengah AC. Jika  dan , maka  ...

  1. begin mathsize 14px style 1 third v with rightwards harpoon with barb upwards on top minus u with rightwards harpoon with barb upwards on top end style

  2. begin mathsize 14px style v with rightwards harpoon with barb upwards on top minus 1 third u with rightwards harpoon with barb upwards on top end style

  3. begin mathsize 14px style 1 third v with rightwards harpoon with barb upwards on top minus 1 over 6 u with rightwards harpoon with barb upwards on top end style

  4. begin mathsize 14px style 1 over 6 v with rightwards harpoon with barb upwards on top minus 2 over 3 u with rightwards harpoon with barb upwards on top end style

  5. begin mathsize 14px style 1 over 6 v with rightwards harpoon with barb upwards on top plus 1 third u with rightwards harpoon with barb upwards on top end style

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S. Ayu

Master Teacher

Mahasiswa/Alumni Universitas Muhammadiyah Prof. DR. Hamka

Jawaban terverifikasi

Jawaban

jawaban tidak ada yang tepat.

jawaban tidak ada yang tepat.

Pembahasan

Diketahui: . P membagi AB dengan . Q titik tengah AC. Vektor dan . Vektor adalah besaran yang memiliki nilai dan arah. Digambarkan seperti berikut: , maka: Q titik tengah AC, maka: Vektor dan , maka: Sehingga diperoleh: Maka . Jadi, jawaban tidak ada yang tepat.

Diketahui:

begin mathsize 14px style increment ABC end style. P membagi AB dengan begin mathsize 14px style AP space colon space PB equals 2 space colon 1 end style.

Q titik tengah AC.

Vektor begin mathsize 14px style CA with rightwards harpoon with barb upwards on top equals u with italic rightwards harpoon with barb upwards on top end style dan begin mathsize 14px style CB with rightwards harpoon with barb upwards on top equals v with italic rightwards harpoon with barb upwards on top end style.

Vektor adalah besaran yang memiliki nilai dan arah.

Digambarkan seperti berikut:

begin mathsize 14px style AP space colon space PB equals 2 space colon 1 end style, maka:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row AP equals cell fraction numerator 2 over denominator 2 plus 1 end fraction AB equals 2 over 3 AB end cell row PB equals cell fraction numerator 1 over denominator 2 plus 1 end fraction AB equals 1 third AB end cell end table end style

Q titik tengah AC, maka:

begin mathsize 14px style AQ equals 1 half AC QC equals 1 half AC end style

Vektor begin mathsize 14px style CA with rightwards harpoon with barb upwards on top equals u with italic rightwards harpoon with barb upwards on top end style dan begin mathsize 14px style CB with rightwards harpoon with barb upwards on top equals v with italic rightwards harpoon with barb upwards on top end style, maka:

begin mathsize 14px style stack C A with rightwards harpoon with barb upwards on top equals u with rightwards harpoon with barb upwards on top rightwards arrow stack A C with rightwards harpoon with barb upwards on top equals negative u with rightwards harpoon with barb upwards on top stack C B with rightwards harpoon with barb upwards on top equals v with rightwards harpoon with barb upwards on top rightwards arrow stack A B with rightwards harpoon with barb upwards on top equals negative v with rightwards harpoon with barb upwards on top end style

Sehingga diperoleh:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row PQ equals cell PA plus AQ end cell row PQ equals cell 2 over 3 AB plus 1 half AC end cell row PQ equals cell 2 over 3 open parentheses BC plus CA close parentheses plus 1 half AC end cell row PQ equals cell 2 over 3 open parentheses negative v with rightwards harpoon with barb upwards on top plus u with rightwards harpoon with barb upwards on top close parentheses plus 1 half open parentheses negative u with rightwards harpoon with barb upwards on top close parentheses end cell row PQ equals cell negative 2 over 3 v with rightwards harpoon with barb upwards on top plus 2 over 3 u with rightwards harpoon with barb upwards on top minus 1 half u with rightwards harpoon with barb upwards on top end cell row PQ equals cell negative 2 over 3 v with rightwards harpoon with barb upwards on top plus 4 over 6 u with rightwards harpoon with barb upwards on top minus 3 over 6 u with rightwards harpoon with barb upwards on top end cell row PQ equals cell negative 2 over 3 v with rightwards harpoon with barb upwards on top plus 1 over 6 u with rightwards harpoon with barb upwards on top end cell end table end style

Maka begin mathsize 14px style PQ with rightwards harpoon with barb upwards on top equals negative 2 over 3 v with rightwards harpoon with barb upwards on top plus 1 over 6 u with rightwards harpoon with barb upwards on top end style.

Jadi, jawaban tidak ada yang tepat.

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Bertrand Aurey J.

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