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VikaPolcha
@VikaPolcha
August 2022
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Решите подробно систему уравнений:
x+y=3
x^2-y^2-4xy+11=0
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Answers & Comments
kaylyona777
X=3-y
(3-y)^2-y^2-4(3-y)y+11=0
9-6y+y^2-y^2-12y+4y^2+11=0
4y^2-18y+20=0 делим все на 2
2y^2-9y+10=0
d=81-80=1^2
y1=2 y2=2.5
y1=2
x1=1
y2=2,5
x2=0,5
1 votes
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Answers & Comments
(3-y)^2-y^2-4(3-y)y+11=0
9-6y+y^2-y^2-12y+4y^2+11=0
4y^2-18y+20=0 делим все на 2
2y^2-9y+10=0
d=81-80=1^2
y1=2 y2=2.5
y1=2
x1=1
y2=2,5
x2=0,5