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AvgustGrom
@AvgustGrom
August 2022
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Найдите сумму восемнадцати первых членов арифметической прогрессии, если первый ее член равен -2, а разность прогрессии равна 4.
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mikael2
Verified answer
S18=(2a1+17d)*18/2=(-4+17*4)*9
s18=576
2 votes
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Verified answer
S18=(2a1+17d)*18/2=(-4+17*4)*9s18=576