Cho

Câu hỏi: Cho $\underset{0}{\overset{3}{\int }}f\left(x\right)dx=5;\underset{0}{\overset{2}{\int }}f\left(t\right)dt=2;\underset{2}{\overset{3}{\int }}g\left(x\right)dx=11$. Tính $I=\underset{2}{\overset{3}{\int }}\left[2f\left(x\right)+6g\left(x\right)\right]dx$

A. 72

B. 80

C. 60

D. 63