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^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:x2+y2-4x+6y+13=0,求代数式(3x+y)2-3(3x-y)(x+y)-(x-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2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值
已知x和y满足方程组3x+2y=4,6x-4y=3,求代数式9x^2-4y^2的值.
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: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x.y满足2x-y=3m,x+2y=4m+5,且x+y=9,求m的值 整体求值
(1)已知x,y满足x的平方+y的平方-4x+10y+29=0,求代数式(x+2y)的平方-(x-3y)(x+3y)的值
已知x-y除以x+y=3,求代数式x+y分之2(x-y)-3(x-y)分之x+y的值.
已知x-y/x+y=2,求代数式2(x-y)/x+y + x+y/3(x-y)的值 快啊.