Matematika

Pertanyaan

A. 1.560
B. 1.380
C. 1.368
D. 1.500
E. 1.638
A. 1.560 B. 1.380 C. 1.368 D. 1.500 E. 1.638

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1 Jawaban

  • u2 = 24
    a+b = 24

    u7 = 54
    a+6b = 54

    a+b = 24
    a+6b = 54
    _________ -
    -5b = - 30
    b = -30/-5
    b = 6

    a+b = 24
    a+6 = 24
    a = 24-6
    a = 18

    s20 = n/2 (2a+(n-1)b)
    s20 = 20/2 (2×18 + 19×6)
    s20 = 10 (36 + 114)
    s20 = 10 (150)
    s20 = 1500 (D)

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