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Câu hỏi: Nếu $\int\limits_{0}^{2}{f\left( x \right)\text{d}x}=5$ thì $\int\limits_{0}^{2}{\left[ 2f\left( t \right)+1 \right]\text{dt}}$ bằng
A. $9.$
B. $11.$
C. $10.$
D. $12.$
Ta có: $\int\limits_{0}^{2}{\left[ 2f\left( t \right)+1 \right]dt}=2\int\limits_{0}^{2}{f\left( t \right)dt+}\int\limits_{0}^{2}{dt=2.5+2=12.}$
A. $9.$
B. $11.$
C. $10.$
D. $12.$
Ta có: $\int\limits_{0}^{2}{\left[ 2f\left( t \right)+1 \right]dt}=2\int\limits_{0}^{2}{f\left( t \right)dt+}\int\limits_{0}^{2}{dt=2.5+2=12.}$
Đáp án D.