Matematika

Pertanyaan

tentukan suku ke 7 dan 10 (deret geometri)

1. 8,16,32,..
2. 9,18,36,..
3. 4,16,64,..
4. 81,27,9,..

1 Jawaban

  • 1. r = 2
        U7 = ar⁶
             = 8. 2⁶
            =  8. 64
            = 512
        U10 = ar⁹
                = 8. 2⁹
                = 8. 512
                = 4096
    2. r = 2
    U7 = ar⁶
             = 9. 2⁶
            =  9. 64
            = 576
        U10 = ar⁹
                = 9. 2⁹
                = 9. 512
                = 4608
    3. r = 4
     U7 = ar⁶
             = 4. 4⁶
            = 16384
        U10 = ar⁹
                = 4. 4⁹
                = 1048576
    4.r = 1/3
        U7 = ar⁶
              = 81. 1/3⁶
             = 1/9
        U10 = ar⁹
                = 81. 1/3⁹
                = 1/243


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