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Câu hỏi: Nếu $\int\limits_{2}^{5}{f\left( x \right)\text{d}x=3}$ và $\int\limits_{2}^{5}{g\left( x \right)\text{d}x=-2}$ thì $\int\limits_{2}^{5}{\left[ f\left( x \right)-g\left( x \right) \right]\text{d}x}$ bằng
A. $-5$.
B. $-6$.
C. $1$.
D. $5$
A. $-5$.
B. $-6$.
C. $1$.
D. $5$
Ta có $\int\limits_{2}^{5}{\left[ f\left( x \right)-g\left( x \right) \right]\text{d}x}=\int\limits_{2}^{5}{f\left( x \right)\text{d}x}-\int\limits_{2}^{5}{g\left( x \right)\text{d}x}=3-\left( -2 \right)=5$.
Đáp án D.