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aleksandrapomes
@aleksandrapomes
August 2022
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найдите сумму первых 20 членов арифметической .прогрессии.:-15;-11;-7 За ранее спасибо ♥
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pplghjgukbdein32
S20 = ((2*(-15) + 4*19) : 2) * 20 = 660
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