8. Let f be a continuous function defined on a closed interval [1, 3] and 3 f (x) ≤ for all ] x ∈[1,3 . Define5ec0e0285523e.jpg
(A)O
(B)X
(C)
(D)

答案：登入後查看
統計： A(1), B(1), C(0), D(0), E(0) #2308496