Matematika

Pertanyaan

u7=15 u11=35 berapa un ?

1 Jawaban

  • U11=35
    U7=15
    Un?

    JAWAB:
    U11=a+10b=35
    U7=a+6b=15
    ____________ -
    4b=20
    b=5

    U7=a+6b=15
    =a+6(5)=15
    =a+30 =15
    =a = -15

    Un= a+(n-1)b
    =-15 + (n-1) 5
    = -15 +5n-5
    =5n-20

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