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Nik23214
@Nik23214
August 2022
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Дана арифметическая прогрессия (аn), разнисть которой равна -3,1 а1 =-2,1. Найдите сумму первых 6 ее членов
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seagullsea
S(n) = а1 + аn/2 * n
S6 = a1 +a6 /2 * 6
а6 = а1 + (n - 1) d
a6 = -2.1+5*(-3.1) = 32.55
S6 = -2.1+32.55 / 2 * 6 = 91.35
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Answers & Comments
S6 = a1 +a6 /2 * 6
а6 = а1 + (n - 1) d
a6 = -2.1+5*(-3.1) = 32.55
S6 = -2.1+32.55 / 2 * 6 = 91.35