Найдите девятнадцатый члкн арифметической прогрессии А1=17d=-5
MASKARAD2211
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12.02.2021 12:00
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1
a₁ = 17
d = - 5
a₁₉ = a₁ + 18d = 17 + 18 * (- 5) = 17 - 90 = - 73
ответ : a₁₉ = - 73