Предмет: Алгебра, автор: Svetlanushka

какой номер имеет член арифметической прогрессии, равный 180, если ее первый член равен -20, а разность равна 2,5?
№6

Ответы

Автор ответа: NoProblemmm
0

180=-20+2.5(n-1)

180=-20+2.5n-2.5

-2.5n=-180-20-2.5

-2.5n=-202.5

n=81

а81=180

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