Matematika

Pertanyaan

suatu barisan arotmatika dengan u7= 100, u15=172. nilai u11

1 Jawaban

  • b = 172-100/15-7 = 72/8 = 9

    U7 = 100
    a+6b = 100
    a+6(9) = 100
    a+54 = 100
    a = 46

    U11 = a+10b = 46+10(9) = 46+90 = 136

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