Matematika

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u7=23 u13=41 di tanya=u9=.......? tolong di jawab ya teman-teman
u7=23 u13=41 di tanya=u9=.......? tolong di jawab ya teman-teman

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1 Jawaban

  • Bab : Barisan dan Deret
    Kelas : IX SMP

    U7 = U1 + 6b = 23
    U13 = U1 + 12b = 41
    -----------------------------
    =======> -6b = -18
    =======> b = 3

    U7 = U1 + 6b
    23 = U1 + 6(3)
    23 = U1 + 18
    U1 = 23 - 18
    U1 = 5

    U9 = U1 + 8b
    U9 = 5 + 8(3)
    U9 = 5 + 24
    U9 = 29

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