已知x,y为正整数,并且xy+x+y=71,x^2y+xy^2=880,求3x²+8xy+3y²

已知xy为正整数,并且xy+x+y=23,x²y+xy²=120,则x²+y²= ,x-y= 已知x,y为正整数,并且xy+x+y=71,x^2y+xy^2=880,求3x²+8xy+3y² 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,Y为正整数,并且XY+X+Y=23,X^2Y+XY^2=120,求xx+yy今天5点之前, 已知x和y都是正整数,并且满足条件xy+x+y=71.X^2y+xy^2=880求x^2+y^2的值. 已知x,y是正整数,并且满足条件xy+x+y+1=71,x²y+xy²=880,求x²+y²的值 已知正整数x,y满足x^-7xy+12y^ x,y为正整数,且x^2-xy-2y^2=7,求x,y x,y为正整数,且x^2-xy-2y^2=7,求x,y 已知xy为正整数,3xy=2x+3y+5.求xy=? 已知xy为正整数,且满足x²-y²=11求 x与y 已知X,Y为正整数,且x+y+xy=23,x^2y+xy^2=120,求x^2+Y^2的值 已知x,y为正整数,并且x*y+x+y=71,x*x*y+x*y*y=880,求3*x*x+8*x*y+3*y*y的值 已知x,y都是正整数,求证x^3+y^3>=x^2y+xy^2 已知正整数x,y满足：xy-x-y=0,则x+2y的最小值 已知x和y都是正整数,并且满足条件中xy+x+y=71.x^2y+xy^2=880.求3x^2+8xy+3y^2的值 已知xy-y^-3=0,且x,y均为正整数,求代数式2x-3y的值 ｛（x,y）|x+2y=7 xy为正整数,