Cho \(\int\limits_{ - 1}^2 {f\left( x \right)dx =...

Câu hỏi: Cho \(\int\limits_{ - 1}^2 {f\left( x \right)dx = 1} \). Tính \(I=\int\limits_{ - 1}^2 {\left[ {x + 2f\left( x \right)} \right]dx} \)

A. \(I = \frac{{11}}{2}\)

B. \(I = \frac{{3}}{2}\)

C. \(I = \frac{{7}}{2}\)

D. \(I = \frac{{5}}{2}\)