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
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
化简求值:已知x、y满足:x^2+y^2-4x+6y+13=0 求代数式 的值.(3x+y)^2-3(3x-y)(x+y
化简求值:已知:X,Y满足:X平方+Y平方-4X+6Y+13=0 ,求(3X+Y)平方-3(3X-Y)(X+Y)-(X-
已知x2-4x-1=0,求代数式(2x-3)2-(x+y)(x-y)-y2的值
已知实数x,y满足x2+3y2+6x-12y+21=0,求x,y的值
已知实数x,y 满足x2+y2+2x-2√3y=0求:
已知实数x、y满足2x2-7xy+3y2=0,求x:y
已知x2+y2-6x+4y+13=0,求2x+3y
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知实数x,y满足关系式│x+y-3│+根号(xy-6)=0,求代数式(x+2y)/y-x的值
化简求值:(-3x2-4y)-(2x2-5y+6)+(x2-5y-1),其中x、y满足|x-y+1|+(x-5)2=0.