已知x+y=-4,xy=-12,求y+1x+1+x+1y+1
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)²
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+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x-y=3,xy=1,求(-2x+2x+3y)-(3xy+2y-2x)-(x+4y+xy)
已知1/x-1/y=2001,求分式x-xy-y/x-y的值
已知1/x-1/y=4,求2x+xy-2y/x-2xy-y的值
已知1/x-1/y=4,求(2x+xy-2y)/(x-2xy-y)
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X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
已知x^2+y^2+x^2y^2-4xy+1=0 求(x-y)^2008-(xy)^2008