題目 8. (10 points) Find the maximum value of the function f(x,y,z)=x+2y+3zf(x,y,z)=x+2y+3zf(x,y,z)=x+2y+3z on the curve of intersection of the plane x−y+z=1x-y+z=1x−y+z=1 and the cylinder x2+y2=1x^2+y^2=1x2+y2=1. 解答
