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a1 = 9, q = 2, an = 1152
n = ?
Korzystam ze wzoru na n-ty wyraz ciagu geometrycznego
an = a1*q(do potegi n-1)
an= 9*2(do potegi n-1) = 1152
9*2(do potegi n-1) = 1152 /:9
2(do potegi n-1) = 128
2 (do potegi n): 2 = 128 /*2
2( do potegi n) = 256
2( do potegi n) = 2⁸
n = 8
Zad.b)
a1 = 25
q = -3
an = 2025
n = ?
Korzystam ze wzoru na n-ty wyraz ciagu geometrycznego
an = a1*q(do potegi n-1)
an= 25*(-3)(do potegi n-1) = 2025
25*(-3)(do potegi n-1) = 2025 /:25
(-3)(do potegi n-1) = 81
(-3) do potegi n : (-3) = 81 /*(-3)
(-3) do potegi n = -243
(-3) do potegi n = (-3)⁵
n = 5
Zadc)
a1 = 54
q = 1/3
an = 2/243
n = ?
Korzystam ze wzoru na n-ty wyraz ciagu geometrycznego
an = a1*q(do potegi n-1)
an= 54*(1/3)(do potegi n-1) = 2/243
54*(1/3)(do potegi n-1) = 2/243 /:54
(1/3)(do potegi n-1) = 1/6561
(1/3) do potegi n : (1/3) = 1/6561
[(1/3) do potegi n ] *3 = 1/6561 /*1/3
(1/3)do potegi n = 1/19683
(1/3) do potegi n = (1/3)⁹
n = 9