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Câu hỏi: Nếu $\int\limits_{1}^{2}{f\left( x \right) }\text{d}x=3, \int\limits_{2}^{5}{f\left( x \right) }\text{d}x=-1$ thì $\int\limits_{1}^{5}{f\left( x \right) }\text{d}x$ bằng
A. $2$.
B. $-2$.
C. $4$.
D. $3$.
Ta có: $\int\limits_{1}^{5}{f\left( x \right) }\text{d}x=\int\limits_{1}^{2}{f\left( x \right) }\text{d}x+\int\limits_{2}^{5}{f\left( x \right) }\text{d}x=3-1=2.$
A. $2$.
B. $-2$.
C. $4$.
D. $3$.
Ta có: $\int\limits_{1}^{5}{f\left( x \right) }\text{d}x=\int\limits_{1}^{2}{f\left( x \right) }\text{d}x+\int\limits_{2}^{5}{f\left( x \right) }\text{d}x=3-1=2.$
Đáp án A.