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Alla2008119
@Alla2008119
August 2021
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Найди и запиши 2 числа,сумма которых равна 9,а произведение-20
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Margarita659
5 и 4
5 + 4 = 9
5 * 4 = 20
1 votes
Thanks 1
svetazuna
Х * у = 20,
х + у = 9,
х = 9 - у,
(9 - у) * у = 20,
9у - у² = 20,
у² - 9у + 20 = 0,
Д = (-9)² - 4*1*20 = 81 - 80 = 1,
у1 = (9+1)/2 = 5,
у2 = (9-1)/2 = 4,
х1 = 9 - 5 = 4,
х2 = 9 - 4 = 5,
ответ: числа 4 и 5
0 votes
Thanks 0
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Answers & Comments
5 + 4 = 9
5 * 4 = 20
х + у = 9,
х = 9 - у,
(9 - у) * у = 20,
9у - у² = 20,
у² - 9у + 20 = 0,
Д = (-9)² - 4*1*20 = 81 - 80 = 1,
у1 = (9+1)/2 = 5,
у2 = (9-1)/2 = 4,
х1 = 9 - 5 = 4,
х2 = 9 - 4 = 5,
ответ: числа 4 и 5