Matematika

Pertanyaan

pada barisan geometri diket U2 = 6 U5 = 48 hitunglah suku ke 10

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2 Jawaban

  • U2=6
    U5=48

    U5/U2 = r^4/r
    48/6 = r^3
    8 = r^3
    3 √8 = r
    2 = r

    U2 = ar
    = a. 2=6
    a=6/2
    a = 3

    Jadi,
    U10 + ar^9
    3.(2)^9
    3.512
    = 1536
  • U2 = a r
    6 = a r
    a = 6/r

    U5 = a r⁴
    48 = (6/r) r⁴
    48 = 6 r³
    r³  = 48/6
        = 8
     r  = 2

    a = 6/r
       = 6/2
       = 3

    U10 = a r⁹
            = 3 (2)⁹
            = 1.536

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