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mariyayakovleva1
@mariyayakovleva1
July 2022
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решите пожалуйста)))
y^3-y^2-y-1
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gfirsov0071
Ну... Чему это равно - не указано, так что решим это (так как оно имеет рациональные корни):
у³ - у² - у - 1 = 1
у³ - у² - у - 2 = 0
Подбор: у = 2
(у - 2)(у² + у + 1) = 0
у² + у + 1 = 0
у = (-1 ± √-3)/2 = -½ ± i√3/2
Ответ: 2; -½ ± i√3/2
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Answers & Comments
у³ - у² - у - 1 = 1
у³ - у² - у - 2 = 0
Подбор: у = 2
(у - 2)(у² + у + 1) = 0
у² + у + 1 = 0
у = (-1 ± √-3)/2 = -½ ± i√3/2
Ответ: 2; -½ ± i√3/2