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Câu hỏi: Nếu $\int\limits_{0}^{2}{\left( f\left( x \right)+3 \right)} \text{d}x=11$ thì $\int\limits_{0}^{2}{f\left( x \right) \text{d}x}$ bằng
A. $8$.
B. $17$.
C. $9$.
D. $5$.
A. $8$.
B. $17$.
C. $9$.
D. $5$.
Ta có $\int\limits_{0}^{2}{\left( f\left( x \right)+3 \right)} \text{d}x=11$ $\Leftrightarrow \int\limits_{0}^{2}{f\left( x \right) \text{d}x}+\int\limits_{0}^{2}{3 \text{d}x}=11\Rightarrow \int\limits_{0}^{2}{f\left( x \right) \text{d}x}=5$
Đáp án D.