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Câu hỏi: Nếu $\int\limits_{0}^{1}{f\left( x \right)\text{d}x=4}$ và $\int\limits_{1}^{3}{f\left( x \right)\text{d}x=3}$ thì $\int\limits_{0}^{3}{f\left( x \right)\text{d}x}$ bằng
A. $12$.
B. $1$.
C. $7$.
D. $-1$
A. $12$.
B. $1$.
C. $7$.
D. $-1$
Ta có $\int\limits_{0}^{3}{f\left( x \right)\text{d}x}=\int\limits_{0}^{1}{f\left( x \right)\text{d}x+\int\limits_{1}^{3}{f\left( x \right)\text{d}x=7}}$.
Đáp án C.