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ВикусяКравченко
@ВикусяКравченко
July 2022
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Знайдіть два числа,сума яких дорівнює 8,5,а добуток 15
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ShirokovP
Verified answer
A + b = 8,5
a*b = 15
a = 8,5 - b
(8,5 - b)b - 15 = 0 *
8,5b - b^2 - 15 = 0 / *(-1)
b^2 - 8,5b + 15 = 0
D = 12,25 = 3,5^2
b1 = ( 8,5 + 3,5)/2 = 6
b2 = (8.5 - 3.5)/2 = 2,5
a1 = 8,5 - 6 = 2,5
b1 = 6
a2 = 8,5 - 2,5 = 6
b2 = 2,5
Ответ
(6; 2,5) (2,5; 6 )
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Answers & Comments
Verified answer
A + b = 8,5a*b = 15
a = 8,5 - b
(8,5 - b)b - 15 = 0 *
8,5b - b^2 - 15 = 0 / *(-1)
b^2 - 8,5b + 15 = 0
D = 12,25 = 3,5^2
b1 = ( 8,5 + 3,5)/2 = 6
b2 = (8.5 - 3.5)/2 = 2,5
a1 = 8,5 - 6 = 2,5
b1 = 6
a2 = 8,5 - 2,5 = 6
b2 = 2,5
Ответ
(6; 2,5) (2,5; 6 )