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ViaVoice
@ViaVoice
July 2022
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Найдите первый член и разность арифметической прогрессии, если:
2)а5+а4=-20
a10+a6=36
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Amigo3
А5+а4=-20⇒2*а4+d=-20⇒2*a1+7*d=-20.
a10+a6=36
⇒2*a1+14*d=36⇒7*d=56⇒d=8. 2*a1+7*8=-20⇒2*a1=-76⇒a1=-38.
Ответ: а1=-38, d=8
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a10+a6=36⇒2*a1+14*d=36⇒7*d=56⇒d=8. 2*a1+7*8=-20⇒2*a1=-76⇒a1=-38.
Ответ: а1=-38, d=8