交线y=t
x=t^2
z=t^(-3)
x'(t0)=2,y'(t0)=1,z'(t0)=-3
切线方程为(x-1)/2=(y-1)/1=(z-1)/(-3)
法平面方程(x-1)*2+(y-1)*1+(z-1)*(-3)=0