Предмет: Алгебра, автор: vanek1488

арифметическая прогрессия начинается так: 5; 4; 3; ... Какое число стоит в этой последовательности на 101-м месте?

Ответы

Автор ответа: 123milka123

0

95
апдлавпэфдвыпмлдвыя

vanek1488: где решение?

vanek1488: а1=5;

а2=4

Тогда по формуле аn найдем d

an=a1 + (n-1)d

4=5+d

d=-1

По этой же формуле найдем а101

а101=5+100*(-1)=5-100=-95

123milka123: я как-то легче решила

123milka123: начало отсчета 5

123milka123: десятка всегда заканчивается на 4

123milka123: 10-4

123milka123: 14,24,34,44,54,64,74,84,94 94-это 100 +1 отв 95

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