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Câu hỏi: Nếu $\int\limits_{0}^{2}{\dfrac{f\left( x \right)}{3}}\text{d}x=4$ thì $\int\limits_{0}^{2}{f\left( x \right)\text{d}x}$ bằng:
A. $12$.
B. $4$.
C. ${{3}^{4}}$.
D. $\dfrac{4}{3}$.
A. $12$.
B. $4$.
C. ${{3}^{4}}$.
D. $\dfrac{4}{3}$.
Do $\int\limits_{0}^{2}{\dfrac{f\left( x \right)}{3}}\text{d}x=4\Leftrightarrow \dfrac{1}{3}\int\limits_{0}^{2}{f\left( x \right)}\text{d}x=4\Leftrightarrow \int\limits_{0}^{2}{f\left( x \right)}\text{d}x=12$
Đáp án A.