已知4(x+0.5)^2+│y+1│=0,求4x^2y-2/3xy^2+4x^2y+2-8x^2y+1/2xy^2的值

已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知：x-y=1,xy=-2.求：(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 .已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 已知1/x-1/y=3,求(3x+4xy-3y)/(x-2xy-y)的值 已知1/x+1/y=3,求3x-4xy+3y/(x+2xy+y)的值 已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值! 已知|3-y|＋|x+y|=0,求[2(x+y)-3(xy+4)]÷1／xy的值. 若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 x-y=1,xy=2.求：(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 已知1/x-1/y=4,求2x+xy-2y/x-2xy-y的值 已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)} 已知X+Y=2XY,求4X-5XY+4Y 除以X+XY+Y 的值