Biết \(\int\limits_0^1 {f\left( x \right)} dx = 2;\int\limits_0^1 {g\left( x \right)} dx = - 4.\) Khi đó \(\int\limits_0^1 {\left[ {f\left( x \right) + g\left( x \right)} \right]}...

Câu hỏi :

Biết \(\int\limits_0^1 {f\left( x \right)} dx = 2;\int\limits_0^1 {g\left( x \right)} dx =  - 4.\) Khi đó \(\int\limits_0^1 {\left[ {f\left( x \right) + g\left( x \right)} \right]} dx\) bằng