問題詳情

5. Which of the following statement is TRUE?
(A)

xf(x)dx =

f(x)dx when f is continuous on [a, b].
(B)

when f is continuous on [a, b] and f(x) ≥ 0 for all x ∈ [a, b].
(C) If f and g are differentiable and 0<f(x) ≤ g(x) on [a, b] then f'(x) ≤ g(x).
(D) If f and g are continuous and 0< f(x) ≤ g(x) on [a, b] then

f(x)dx≤

g(x)dx.

參考答案