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няяшкааа
@няяшкааа
July 2022
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Знайти суму членів арифметичної прогресії ([tex]a_n _{} [/tex]), якщо a1 =–3; d= 10; n=8.
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Aigul9912
An=a1+(n-1)d=-3+7*10=67
S=(a1+an)/2*n=(-3+67)/2*8=256
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S=(a1+an)/2*n=(-3+67)/2*8=256