已知2X2+ 4X+Y2=2XY-4,求X^y的值

已知x2+y2+4x-2y+5=0,求x2+2xy+y2值 已知x/y+y/x=2,求(x2+xy+y2)/(x2-4xy+y2)的值 已知x满足2x2+4x+y2=2xy-4 求：xy 已知x(x-1)-(x2-y)=-2求x2+y2-4xy的值 已知x+y=4,xy=2,求x2+y2+3xy的值. 已知X2+Y2+8X+6Y+25=0 求代数式X2++XY+4Y2分之X2-4Y2 减X+2Y分之X的值 已知x2+4y2+x2y2+1=6xy,则(x4-y4)/(2x2+xy-y2)*(2x-y)/(xy-y2)/(x2+y2/y)2= 已知:x-y= -2 求(x2+y2)2-4xy(x2+y2)+4x2y2的值 已知x2+4y2+x2y2-6xy+1=0,求 x4-y4/2x-y 乘 2xy-y2/xy-y2 除以（x2+y2/xy）2乘1/x+y的值 已知2X2+ 4X+Y2=2XY-4,求X^y的值 已知x/y=2,求（x+y）2-4xy/x2+y2 已知：x/2=y/3=z/4,求（x2+y2-z2-2xy）/（x2-y2+z2-2xz）除以（x2-y2-z2+2yz)/(x2+y2-z2+2xy) 已知：x/2=y/3=z/4,求（x2+y2-z2-2xy）/（x2-y2+z2-2xz）除以（x2-y2-z2+2yz)/(x2+y2-z2+2xy) 已知x2+y2=7,xy=-2,求5x2—3xy—4y2—11xy—7x2+2y2的值 已知X2+y2=7,Xy=-2,求多项式5X2一3Xy-4y2-11Xy-7X2+2y2的值. 已知x2+xy=4,xy+y2=12,求代数式x2-y2与x2+2xy+y2的值各为多少格式正确 已知x2+y2 =7,xy=-2.求5x2 -3xy-4y2 -11xy-7x2 +2y2 已知x2+4y2-2x+4y+2=0 求xy