題目 Problem 甲、計算、證明題：共 3 題，每題 12 分，共 36 分。須詳細寫出計算及證明過程，否則不予計分。 Find the points on the sphere x2+y2+z2=4x^2+y^2+z^2=4x2+y2+z2=4 that are closest to and farthest from the point (3,1,−1)(3,1,-1)(3,1,−1). 解答
