Предмет: Алгебра, автор: mrbrain22222

выписаны первые несколько членов арифметической прогрессии: 10; 7; 4;... какое число стоит в этой арифметической прогрессии на 91-м месте

Ответы

Автор ответа: Lesben

a1 = 10, d= a2-a1= 7-10=-3
an = a1 + (n-1)d
a91 = a1 + 90.(-3)
a91=10-270, a91=-260

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