July 2022 1 2 Report
В арифметической прогресии сумма 3-го и 17-го членов равна 20. Найдите сумму первых 19-ти членов этой прогресии. (ПОЖАЛУЙСТА С ОБЪЯСНЕНИЕМ)
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otrezok as v tri raza bolshe otrezka sd najdite otnoshenie vsad esli tochka v se
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