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найти сумму арифметической прогрессии всех нечетных чисел ( от 1 до 49)
Ответы 1
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S=1+3+5+...+49(3+49)=52(5+47)=52Таких пар будет 12 и число 1 без парыS=52*12+1=625п-нечётное число,один член(например.первый будет без пары)
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Автор:
casianofisher - 6 лет назад
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1Answer: a member of a group living under the rule of a government
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