Plot3D[(x^2) (y^3),{x,-1,1},{y,-1,1}]

Plot3D[(((x^2) y)/((x^2)+(y^2))),{x,-1,1},{y,-1,1}]

Plot3D[((y^3)/(Sqrt[(x^2)+(y^2)])),{x,-1,1},{y,-1,1}]

Plot3D[Abs[ x y],{x,-1,1},{y,-1,1}]

Plot3D[((x^2)+(y^2))Sin[(1/((x^2)+(y^2)))],{x,-1,1},{y,-1,1}]

Plot3D[CubeRoot[(x^3)+(y^3)],{x,-1,1},{y,-1,1}]

Plot3D[Exp[((-1)/((x^2)+x y+(y^2)))],{x,-1,1},{y,-1,1}]