Đáp án đúng: C $I=\int\limits_{-2}^{-1}{dx+\int\limits_{-1}^{0}{(2x+1)dx+\int\limits_{0}^{1}{dx.}}}$ $\begin{array}{l}I=\left. x \right|_{-2}^{-1}+\left. \left( {{x}^{2}}+x \right) \right|_{-1}^{0}+\left. x \right|_{0}^{1}\\=1-\left( 1-1 \right)+1=2.\end{array}$