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Câu hỏi: Nếu $\int\limits_{1}^{2}{f\left( x \right)}\text{d}x=3$ và $\int\limits_{2}^{5}{f\left( x \right)}\text{d}x=-4$ thì $\int\limits_{1}^{5}{f\left( x \right)}\text{d}x$
A. $-1.$
B. $1.$
C. $-12.$
D. $7.$
A. $-1.$
B. $1.$
C. $-12.$
D. $7.$
Ta có: $\int\limits_{1}^{5}{f\left( x \right)}\text{d}x=\int\limits_{1}^{2}{f\left( x \right)}\text{d}x+\int\limits_{2}^{5}{f\left( x \right)}\text{d}x=3-4=-1$.
Đáp án A.