August 2021 0 12 Report
1)найдите сумму первых двадцати шести членов арифметической прогрессии ( Cn):7;11;... . 2)Найдите разность и первый член арифметической прогрессии (an), если a7=57, a15=53.
3) найдите сумму всех натуральных двузначных чисел, кратных трём.
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