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¿Un ejercicio de interpolacion?

a) interpolar cinco medios aritmeticos entre -20 y 27

b) Determine el ultimo termino y la suma de la progresion aritmetica de 48, 45,42,..., si cuenta con 15 terminos,

favor respuesta con procedimiento por favor, para pasar la materia, gracias

1 Answer

Rating
  • Anonymous
    9 years ago
    Favorite Answer

    Problema 1

    para interpolar medios usamos la fórmula

        b - a

    d = ---------

        m + 1

    donde d = diferencia (ó razón)

    a = menor término conocido (no la cantidad mayor)

    b = mayor término conocido

    m = medios a interpolar

        27 + 20

    d = ----------- = 47/6

         5 + 1

    -20, -73/6, -13/6, 7/2, 34/3, 115/6, 27

    Problema 2

    buscamos el término general

    a_n = a_1 + (n - 1)(d)

    45 - 48 = -3

    42 - 45 = -3

    d = -3

    a_1 = 48

    a_n = 48 + (n - 1)(-3)

    a_n = 48 - 3n + 3

    a_n = -3n + 51

    el témino 15

    a_15 = -3(15) + 51 = -45 + 51 = 6

    en cuanto a la suma usamos

          (a_1 + a_n)(n)

    s_n = - - - - - - - - - - -

              2

          (48 + 6)(15)

    s_15 = - - - - - - - - -

              2

          (54)(15)

    s_15 = - - - - - - = (27)(15) = 405

            2

    48 + 45 + 42 + 39 + 36 + 33 + 30 + 27 + 24 + 21 + 18 + 15 + 12 + 9 + 6 = 405

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