Вопрос школьника по предмету Алгебра
В арифметической прогрессии (аn-ой) а6=3,d=0,6
Найдите а1
Ответ учителя по предмету Алгебра
По определению арифметической прогрессии:
an = a1 + d(n — 1)
a1 = an — d(n — 1)
a1 = a6 — 5d
a1 = 3 — 5•0,6 = 3 — 3 = 0.
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