求解,求过程,急求!!!!!!!! 20
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x+3y=2 x=2-3y
3x²+2xy+y²-3y+1=0
3(2-3y)²+2(2-3y)y+y²-3y+1=0
3(4-12y+9y²)+(4y-6y²)-3y+1=0
12-36y+27y²+4y-6y²-3y+1=0
27y²-6y²-36y+4y-3y+12+1=0
21y²-35y+13=0
y²-5y/3+13/21=0
y²-5y/3=-13/21
y²-5y/3+(5/6)²=25/36-13/21
(y-5/6)²=1225/1764-1092/1764
y-5/6=±√133/42
y=5/6±√133/42
y=(35±√133)/42
x=2-3(35±√133)/42
=2-(35±√133)/14
=(28-35-+√133)/14
=(-7-+√133)/14
3x²+2xy+y²-3y+1=0
3(2-3y)²+2(2-3y)y+y²-3y+1=0
3(4-12y+9y²)+(4y-6y²)-3y+1=0
12-36y+27y²+4y-6y²-3y+1=0
27y²-6y²-36y+4y-3y+12+1=0
21y²-35y+13=0
y²-5y/3+13/21=0
y²-5y/3=-13/21
y²-5y/3+(5/6)²=25/36-13/21
(y-5/6)²=1225/1764-1092/1764
y-5/6=±√133/42
y=5/6±√133/42
y=(35±√133)/42
x=2-3(35±√133)/42
=2-(35±√133)/14
=(28-35-+√133)/14
=(-7-+√133)/14
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