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Câu hỏi: Cho $\int\limits_{0}^{6}{f\left( x \right)\text{d}x}=2$ và $\int\limits_{0}^{6}{g\left( x \right)\text{d}x}=7$, khi đó $\int\limits_{0}^{6}{\left[ f\left( x \right)-g\left( x \right) \right]\text{d}x}$ bằng
A. $5.$
B. $14.$
C. $-5.$
D. $9.$
A. $5.$
B. $14.$
C. $-5.$
D. $9.$
Ta có $\int\limits_{0}^{6}{\left[ f\left( x \right)-g\left( x \right) \right]\text{d}x}=\int\limits_{0}^{6}{f\left( x \right)\text{d}x}-\int\limits_{0}^{6}{g\left( x \right)\text{d}x}=2-7=-5.$
Đáp án C.