已知x2+y2-6x+4y+13=0,求2x+3y
已知x2+y2+4x-6y+13=0 求x2-2x\x2+3y2
已知x2+y2-6x+4y+13=0,求2x+3y
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已知x2-4x+y2-6y+13=0求x2+y2的值?
已知:x2+4x+y2-6y+13=0,求(x-2y)/(x²+y²)
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已知x2-4x+y2+6y+13=0,求x-y的值
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化简求值:已知x、y满足:x2+y2-4x+6y+13=0,求代数式(3x+y)2-3(3x-y)(x+y)-(x-3y
已知x,y满足x2+y2-6x-2y+5=0,求x2+y2的最大值
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
已知x2+y2+4x-6y+13=0