01.04.2022

(2а-1)в кубе — 8а в кубе + 5 при а = — 2 дам 30 баллов

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Алгебра

Вопрос школьника по предмету Алгебра

(2а-1)в кубе — 8а в кубе + 5 при а = — 2
дам 30 баллов

Ответ учителя по предмету Алгебра

(2a-1)³ — 8a³ + 5 = (2*(-2) — 1)³ — 8*(-2)³ + 5 = -5³ +8*8 + 5 = -125 + 64 + 5 = -120 + 64 = -56

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