August 2021 0 15 Report
Помогите. При каком значении х значение выражения 2х - 1, х + 3, х + 15 будут последовательными членами геометрической прогрессии? Найдите сумму пяти первых членов этой прогрессии. Знаю, что х1=-24,и х2=1, а дальше , не получается
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