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Mathematics, 19.03.2020 14:59 mvtthewisdead

Знайди шістнадцятий член і суму тридцяти перших членів арифметичної прогресії (an), якщо a1=4,2 і a2=2,4.
срочно , очень нужно​

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Знайди шістнадцятий член і суму тридцяти перших членіÐ...
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