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dogdoga
@dogdoga
August 2021
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Найдите сумму первых пятнадцати членов арифметической прогрессии, заданной перечислением: -2,-5,-8
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ShirokovP
Verified answer
A1 = - 2
a2 = - 5
d = a2 - a1 = - 5 + 2 = - 3
a15 = a1 + 14d = - 2 - 14*3 = - 44
S15 - ?
S15 = (a1 + a15)/2*15 = 7,5 * ( - 2 - 44) = - 345
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Answers & Comments
Verified answer
A1 = - 2a2 = - 5
d = a2 - a1 = - 5 + 2 = - 3
a15 = a1 + 14d = - 2 - 14*3 = - 44
S15 - ?
S15 = (a1 + a15)/2*15 = 7,5 * ( - 2 - 44) = - 345