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Câu hỏi: Nếu ${\int\limits_{-1}^{3}{f\left( x \right)\text{d}x}=- 5}$ và ${\int\limits_{3}^{5}{f\left( x \right)\text{d}x}=1}$ thì $\int\limits_{-1}^{5}{f\left( x \right)\text{d}x}$ bằng
A. $6$.
B. $- 4$.
C. $4$.
D. $- 6$.
A. $6$.
B. $- 4$.
C. $4$.
D. $- 6$.
Ta có: $\int\limits_{-1}^{5}{f\left( x \right)\text{d}x}=\int\limits_{-1}^{3}{f\left( x \right)\text{d}x}+\int\limits_{3}^{5}{f\left( x \right)\text{d}x}=- 5+1=- 4$.
Đáp án B.