用matlabclear;clcf=@(x,y,z)(x.^2 + (9/4)*y.^2 + z.^2 - 1).^3 - x.^2.*z.^3 - (9/80)*y.^2.*z.^3;gd=80;x=linspace(-3,3,gd);y=linspace(-3,3,gd);z=linspace(-3,3,gd);[x,y,z]=meshgrid(x,y,z);val=f(x,y,z);[f,...