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Câu hỏi: Cho $\int\limits_{0}^{1}{f\left( x \right)\text{d}x=3}$ và $\int\limits_{1}^{4}{f\left( x \right)\text{d}x=7}$. Khi đó $\int\limits_{0}^{4}{f\left( x \right)\text{d}x}$ bằng
A. $4$.
B. $21$.
C. $10$.
D. $-4$.
A. $4$.
B. $21$.
C. $10$.
D. $-4$.
$\int\limits_{0}^{4}{f\left( x \right)\text{d}x}=\int\limits_{0}^{1}{f\left( x \right)\text{d}x}+\int\limits_{1}^{4}{f\left( x \right)\text{d}x}=3+7=10$
Đáp án A.