已知(4x-2y -1)^2+根号xy-2=0 求4x^3Y-4x^2Y^2+xY^3
已知X—根号3XY-4Y=0,求(2X+3根号XY-2Y)/(3X-根号XY+Y)的值
已知2x-3根号xy-2y=0(x>0),求x^2+4xy-16y^2/x^2+xy-9y^2
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
已知根号x+2y=3;根号4x-2y=4求xy
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>0,y>0,x+根号xy-6y=0,求4x+5根号xy-6y分之x+2根号xy
已知 x-3*根号(xy)-4y=0,则 [2x+3*根号(xy)-2y]/[3x-根号(xy)+y]=______
已知正实数x y满足x-根号xy-2y=0求 x+3根号xy+2y/2x-2根号下xy-y
已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值!
已知x-y=3,xy=1,求(-2x+2x+3y)-(3xy+2y-2x)-(x+4y+xy)
已知(4x-2y -1)^2+根号xy-2=0 求4x^3Y-4x^2Y^2+xY^3