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shamags
@shamags
October 2021
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Дана арифметическая прогрессия: -4, -1, 2. Найдите сумму первых шести её членов.
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katgm
D=a2-a1=-1+4=3
a6=a1+5d=-4+15=11
S6=a1+a6/2*6=11-4/2*6=21
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Answers & Comments
a6=a1+5d=-4+15=11
S6=a1+a6/2*6=11-4/2*6=21