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Câu hỏi: Biết $\int\limits_{2}^{3}{f\left( x \right)\text{d}x=4}$ và $\int\limits_{2}^{3}{g\left( x \right)\text{d}x=1}$. Khi đó $\int\limits_{2}^{3}{\left[ f\left( x \right)-g\left( x \right) \right]\text{d}x}$ bằng
A. $5$.
B. $4$.
C. $3$.
D. $-3$.
A. $5$.
B. $4$.
C. $3$.
D. $-3$.
Ta có, $\int\limits_{2}^{3}{\left[ f\left( x \right)-g\left( x \right) \right]\text{d}x}=\int\limits_{2}^{3}{f\left( x \right)\text{d}x-\int\limits_{2}^{3}{g\left( x \right)\text{d}x=4-1=3}}$.
Đáp án C.