若x,y为正整数,且满足3x(x+y)-y(x+y)=7,求x,y

若x,y为正整数,且满足3x(x+y)-y(x+y)=7,求x,y
若x,y为正整数,且满足3x(x+y)-y(x+y)=7,求x,y

若x,y为正整数,且满足3x(x+y)-y(x+y)=7,求x,y
(3x-y)(x+y)=7
都是正整数,则
3x-y=1,x+y=7 或：3x-y=7,x+y=1