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Câu hỏi: Biết $\int\limits_{2020}^{2021}{f\left( x \right)\text{d}x}=\dfrac{4041}{2}$. Giá trị của $\int\limits_{2020}^{2021}{2f\left( x \right)\text{d}x}$ bằng
A. $\dfrac{4041}{4}$.
B. $4041$.
C. $\dfrac{2021}{2}$.
D. $2020$.
A. $\dfrac{4041}{4}$.
B. $4041$.
C. $\dfrac{2021}{2}$.
D. $2020$.
Ta có : $\int\limits_{2020}^{2021}{2f\left( x \right)\text{d}x}=2.\int\limits_{2020}^{2021}{f\left( x \right)\text{d}x}=2.\dfrac{4041}{2}=4041$.
Đáp án B.