第一式变形为：x^2-y^2-(5x-5y)=0,(x+y)(x-y)-5(x-y)=0,(x+y-5)(x-y)=0所以,x=y或x=5-y,把x=y代入第二式得：3*y^2=49,所以,y=-7√3/3,（x=-7√3/3）或y=7√3/3,（x=7√3/3）把x=5-y代入第二式得：(5-y)^2+(5-y)*y+y^...