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Câu hỏi: Nếu $\int\limits_{1}^{7}{f\left( x \right)\text{d}}x=5$ và $\int\limits_{7}^{10}{f\left( x \right)\text{d}}x=-2$ thì $\int\limits_{1}^{10}{f\left( x \right)\text{d}x}$ bằng
A. $-2$.
B. $8$.
C. $0$.
D. $3$.
A. $-2$.
B. $8$.
C. $0$.
D. $3$.
Ta có $\int\limits_{1}^{10}{f\left( x \right)\text{d}x}=\int\limits_{1}^{7}{f\left( x \right)\text{d}x}+\int\limits_{7}^{10}{f\left( x \right)\text{d}x}=5-2=3.$
Đáp án D.