Cho $\displaystyle\int\limits_{0}^{1}f\left(x\right)\, \mathrm{d}x = 2$ và $\displaystyle\int\limits_{0}^{1}g\left(x\right)\, \mathrm{d}x = 5$, khi đó $\displaystyle\int\limits_{0}^{1}\left[f\left(x\right) - 2g\left(x\right)\right]\, \mathrm{d}x$ bằng