若x^2-4x+y^2+6y+13=0 则 x= y=
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若x^2-4x+y^2+6y+13=0 则 x= y=
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x^2-4x+y^2+6y+13=(x-2)^2+(y+3)^2-13+13=0
(x-2)^2+(y+3)^2=0
x=2,y=-3
(x-2)^2+(y+3)^2=0
x=2,y=-3
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
x平方-4x+2y+6y+13=0则x= y=?
设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
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若实数X,Y满足X²+Y²+4X-2Y +1=0,则X²-6X+Y²-2Y的最大
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已知X^2+Y^2+4X-6Y+13=0,X、Y为实数,则Y^2等于?
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已知x²+y²-6x+4y+13=0,求(2x-y)²-2(2x-y)(x+2y)+(x+
已知x²+y²+13-4x+6y=0,求(2x-y)²-2(2x-y)(x+2y)+(x+