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Câu hỏi: Nếu $\int\limits_{0}^{2}{f\left( x \right)\text{d}x}=5$ thì $\int\limits_{0}^{2}{\left[ f\left( x \right)-1 \right]\text{d}x}$ bằng
A. $5$.
B. $3$.
C. $4$.
D. $8$.
A. $5$.
B. $3$.
C. $4$.
D. $8$.
Ta có $\int\limits_{0}^{2}{\left[ f\left( x \right)-1 \right]\text{d}x}=\int\limits_{0}^{2}{f\left( x \right)\text{d}x}-\int\limits_{0}^{2}{\text{d}x}=5-2=3$.
Đáp án B.