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Katrinochka
@Katrinochka
July 2022
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Решить систему уравнений : х+у=8
ху=15
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RightWay95
X=8-y;
y(8-y)=15;
8y-y^2-15=0;
-y^2+8y-15=0;
D=64-60=4;
y1=(-8-2)/(-2)=5;
y2=(-8+2)/(-2)=3;
x1=8-5=3;
x2=8-3=5;
Ответ: (3;5); (5:3).
4 votes
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Answers & Comments
y(8-y)=15;
8y-y^2-15=0;
-y^2+8y-15=0;
D=64-60=4;
y1=(-8-2)/(-2)=5;
y2=(-8+2)/(-2)=3;
x1=8-5=3;
x2=8-3=5;
Ответ: (3;5); (5:3).