Odpowiedzi

2009-11-10T17:58:09+01:00
SUma Ciągu geometrycznego
Oblicz
S₄= ? a₁=10 Q=3

S4 = a1* 1- q do potęgi n / 1-q
S4 = 10 * 1- 81 / -2
S4 = 10 * -80 / -2
S4 = -800 / - 2
S4 = 400
2009-11-10T17:59:36+01:00
A1 = 10 , q = 3
S4 = 10*[1- 3^4]/[1 -3] = 10*[1 -81]/(-2) = -800/(-2) =400