Lim x^3y+xy^4+x^2y/x+y,x→0,y→0Lim x^3y+xy^4+x^2y/x+y= Lim x^3(x^3-x)+x(x^3-x)^4+x^2(x^3-x)/x+(x^3-x)，此时x→0,y→x^3-x.= Lim -x^3-x^4+0(x^4)/x^3 = -1