Câu hỏi: Tích phân $\int\limits_{0}^{2}{\dfrac{\text{d}x}{x+3}}$ bằng A. $\dfrac{16}{225}$. B. $\ln \dfrac{5}{3}$. C. $\log \dfrac{5}{3}$. D. $\dfrac{2}{15}$.
Ta có $\int\limits_{0}^{2}{\dfrac{\text{d}x}{x+3}}=\left. \ln \left| x+3 \right| \right|_{0}^{2}=\ln 5-\ln 3=\ln \dfrac{5}{3}$.
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