Cho \(\int\limits_{ - 2}^1...

C

- Hướng dẫn giải

Ta có: $\int\limits_{ - 2}^1 {\left( {1 - f(x) + 3g(x)} \right)} \,dx$

$= \left( x \right)\left| {_{ - 2}^1} \right. - \int\limits_{ - 2}^1 {f\left( x \right)} \,dx + 3\int\limits_{ - 2}^1 {g\left( x \right)} \,dx$

$= 3 - 1 + 3.\left( { - 2} \right) =  - 4$