已知xy=8满足x^2y-xy^2-x+y=56,求x^2+y^2的值

已知x-xy=8,xy-y=-9,求x+y-2xy的值 已知xy=8满足x^2y-8xy^2-x+y=56,求x^2+y^2的值 已知XY=8,满足Xˇ2Yˇ-XYˇ2-X+Y=56,求Xˇ2+Yˇ2的值 已知xy=8满足x^2y-xy^2-x+y=56,求x^2+y^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? 若x,y满足x^+2y^-2xy+1=0,求xy的值 正数xy满足x2-y2=2xy,求x+y分之x-y的值 正整数x,y满足x2-y2=2xy,求x-y/x+y的值 整数x,y满足x2-y2=2xy,求x-y/x+y的值 已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值 已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方 已知x和y是正整数,并且满足条件xy+x+y=71,x^2y +xy^2=880,求x^2+y^2的值