вычислите значение суммы 6,8+9,3+11,8+...+56,8. Created by smorkovkina01. algebra-ru

вычислите значение суммы 6,8+9,3+11,8+...+56,8...

smorkovkina01 @smorkovkina01

April 2021 1 14 Report

вычислите значение суммы 6,8+9,3+11,8+...+56,8

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ShirokovP

Verified answer

A₁= 6.8
a₂ = 9.3
d = 9.3 - 6.8 = 2.5
an = 56.8
Sn - ?

an = a₁ + d (n - 1) = 56.8
6.8 + 2.5 (n - 1) = 56.8
6.8 + 2.5n - 2.5 = 56.8
2.5n = 52,5
n = 21

S₂₁ = (a₁ + a₂₁)/2* 21 = 10,5* (6,8 + 56,8) = 667,8

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