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liza8851
@liza8851
July 2022
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решить способом подстановки :х-5у=9 (нижняя строка)х^2+ 3ху-у^2=3
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LavkaHorsovna
Х - 5y=9 x = 9 + 5y
x2 + 3xy - y2 = 3
(9+5y)2 + 3y(9+5y) - y2 = 3
39y2 +117y+78=0
y2+3y+2=0
D=1
y= -1; -2
Ответ - (4; -1). (-1; -2)
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liza8851
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Answers & Comments
x2 + 3xy - y2 = 3
(9+5y)2 + 3y(9+5y) - y2 = 3
39y2 +117y+78=0
y2+3y+2=0
D=1
y= -1; -2
Ответ - (4; -1). (-1; -2)