matlab绘制二元函数z=x∧2+y∧2,y=0,y=x∧2,z=0的图像答:subplot 221fimplicit3(@(x,y,z) x.^2+y.^2 - z)title('z=x^2+y^2')subplot 222fimplicit3(@(x,y,z) y)title('y=0')subplot 223fimplicit3(@(x,y,z) x.^2-y)title('y=x^2')subplot 224fimplicit3(@(x,y,z) z)title('z=0')matlab版本2017 ...