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Câu hỏi: Nếu $\int\limits_{0}^{1}{f\left( x \right)\text{d}x}=2$ và $\int\limits_{1}^{3}{f\left( x \right)\text{d}x}=5$ thì $\int\limits_{0}^{3}{f\left( x \right)\text{d}x}$ bằng
A. $3$.
B. $10$.
C. $7$.
D. $-3$.
A. $3$.
B. $10$.
C. $7$.
D. $-3$.
Ta có: $\int\limits_{0}^{3}{f\left( x \right)\text{d}x}=\int\limits_{0}^{1}{f\left( x \right)\text{d}x}+\int\limits_{1}^{3}{f\left( x \right)\text{d}x}=2+5=7$.
Đáp án C.