26. The maximum value of the function f (x, y, z) = x + 2y + 3z subject to the constraint x2 + y2 + z2 = 25 is _______. 

(A) 7√14

(B) 5e9d568b1bac2.jpg

(C) 5√14

(D) 15

(E) 5e9d569e53eab.jpg

答案：登入後查看
統計： A(0), B(0), C(1), D(0), E(0) #2264890