已知x^2+2xy+2y^2-6y+9=0,求x和y的值.
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已知x^2+2xy+2y^2-6y+9=0,求x和y的值.已知x^2+2xy+2y^2-6y+9=0,求x和y的值.已知x^2+2xy+2y^2-6y+9=0,求x和y的值.此方程有两个未知数,但只一
已知x^2+2xy+2y^2-6y+9=0,求x和y的值.
已知x^2+2xy+2y^2-6y+9=0,求x和y的值
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已知x^2+2xy+2y^2-6y+9=0,求x和y的值.
此方程有两个未知数,但只一个方程,一般应用配方法解.
x^2 + 2xy + 2y^2 - 6y + 9 = 0
x^2 + 2xy + y^2 + y^2 - 6y + 9 = 0
(x + y)^2 + (y - 3)^2 = 0
y = 3
x = -y = -3
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