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alev76s
@alev76s
August 2022
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решите пожалуйста уравнение
х^2-20=х
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krugly1981
X² - x - 20 = 0
D = b² - 4ac = (-1)² - 4 × 1 × ( - 20) = 1 + 80 = 81 = 9²
x1 = ( 1 + 9 )/2 = 5
x2 = ( 1 - 9) / 2 = - 4
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Thanks 1
alev76s
спасибо
krugly1981
пожалуйста,успехов!
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Answers & Comments
D = b² - 4ac = (-1)² - 4 × 1 × ( - 20) = 1 + 80 = 81 = 9²
x1 = ( 1 + 9 )/2 = 5
x2 = ( 1 - 9) / 2 = - 4