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maksim6646
@maksim6646
August 2022
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знайдіть два числа сума чисел яких дорівнює 15 а їх добуток -126
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djsjf30
X + y = 15
xy = -126
x = 15 - y
y(15-y) = -126
-y^2 + 15y + 126 = 0
D = 729.
x1,2 = (-15 +- 27 ) / (-2).
x1 = -6;
x2 = 21.
y1 = 21;
y2 = -6.
Итого: -6 и 21.
2 votes
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Answers & Comments
xy = -126
x = 15 - y
y(15-y) = -126
-y^2 + 15y + 126 = 0
D = 729.
x1,2 = (-15 +- 27 ) / (-2).
x1 = -6;
x2 = 21.
y1 = 21;
y2 = -6.
Итого: -6 и 21.