Plot3D[fx,y]( x,-2, 2), y-1, 4, PlotRange->(-4,0) PlotPoints->30, View Point->(2504, -2.105,0.86711 Contour Plot[[x,y](x,-2, 2, y, -1, 4), Contour Shading->False, Contours->30, PlotPoints->601 {Y→0,x→-1};{Y→2,x→1}} 结果Plot3D[f[x,y],{x,-2,2},{y,-1,4},PlotRange->{-4,0}, PlotPoints->30,ViewPoint->{2.504,-2.105,0.867}]; ContourPlot[f[x,y],{x,-2,2},{y,-1,4},ContourShading->False, Contours->30,PlotPoints->60]; 结果：