Câu hỏi: Cho $\int\limits_{0}^{1}{f\left( x \right)d\text{x}}=2$. Khi đó $\int\limits_{0}^{1}{\left[ 2f\left( x \right)+{{e}^{x}} \right]d\text{x}}$ bằng:
A. $e+3$
B. $5+e$
C. $3-e$
D. $5-e$
A. $e+3$
B. $5+e$
C. $3-e$
D. $5-e$
Ta có: $\int\limits_{0}^{1}{\left[ 2f\left( x \right)+{{e}^{x}} \right]d\text{x}}=2\int\limits_{0}^{1}{f\left( x \right)d\text{x}}+\int\limits_{0}^{1}{{{e}^{x}}d\text{x}}=\left. 2.2+{{e}^{x}} \right|_{0}^{1}=4+e-1=3+e$.
Đáp án A.