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tsukanovasasha
@tsukanovasasha
July 2022
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Решите системы уравнений:
1)x-4y=3
xy+2y=9
2)x-y=3
x^2-xy-2y^2=7
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hraky
1) Х=3+4у
У(3+4у+2)=9
4у^2+5у-9=0
D=25+144=13^2
Y1=(-5-13)/8=-2,25
Y2=(-5+13)/8=1
X1=3-9=-6
X2=3+4=7
2) X=3+y
(3+y)^2-y(3+y)-2y^2-7=0
9+6y+y^2-3y-y^2-2y^2-7=0
-2y^2+3y+2=0
2y^2-3y-2=0
D=9+16=5^2
Y1=(3-5)/4=-0,5
Y2=(3+5)/4=2
X1=3-0,5=2,5
X2=3+2=5
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Answers & Comments
У(3+4у+2)=9
4у^2+5у-9=0
D=25+144=13^2
Y1=(-5-13)/8=-2,25
Y2=(-5+13)/8=1
X1=3-9=-6
X2=3+4=7
2) X=3+y
(3+y)^2-y(3+y)-2y^2-7=0
9+6y+y^2-3y-y^2-2y^2-7=0
-2y^2+3y+2=0
2y^2-3y-2=0
D=9+16=5^2
Y1=(3-5)/4=-0,5
Y2=(3+5)/4=2
X1=3-0,5=2,5
X2=3+2=5