已知X,Y为正整数,并且XY+X+Y=23,X^2Y+XY^2=120,求x-y=
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
已知xy为正整数,3xy=2x+3y+5.求xy=?
已知xy-y^-3=0,且x,y均为正整数,求代数式2x-3y的值
已知x,y是正整数,并且满足条件xy+x+y+1=71,x²y+xy²=880,求x²+y
正整数x,y满足x2-y2=2xy,求x-y/x+y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是正整数,并且xy+x+y=23,x2y+xy2=120.求x2+y2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-xy=8,xy-y=-9,求x+y-2xy的值
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y