Câu hỏi: $\int{\dfrac{\text{d}x}{4-2x}}$ bằng A. $\dfrac{1}{2}\ln \left| 4-2x \right|+C$. B. $\ln \left| 4-2x \right|+C$. C. $-\dfrac{1}{2}\ln \left| 4-2x \right|+C$. D. $\dfrac{1}{4}\ln \left| 4-2x \right|+C$.
Ta có $\int{\dfrac{\text{d}x}{4-2x}}=-\dfrac{1}{2}\ln \left| 4-2x \right|+C$