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Câu hỏi: Khẳng định nào sau đây đúng?
A. $\int{\left( {{3}^{x}}+2x \right)dx}=\dfrac{{{3}^{x+1}}}{x+1}+{{x}^{2}}+C$.
B. $\int{\left( {{3}^{x}}+2x \right)dx}=\dfrac{{{3}^{x}}}{\ln 3}+{{x}^{2}}+C$.
C. $\int{\left( {{3}^{x}}+2x \right)dx}={{3}^{x}}+{{x}^{2}}+C$.
D. $\int{\left( {{3}^{x}}+2x \right)dx}={{3}^{x}}\ln 3+\dfrac{{{x}^{2}}}{2}+C$.
A. $\int{\left( {{3}^{x}}+2x \right)dx}=\dfrac{{{3}^{x+1}}}{x+1}+{{x}^{2}}+C$.
B. $\int{\left( {{3}^{x}}+2x \right)dx}=\dfrac{{{3}^{x}}}{\ln 3}+{{x}^{2}}+C$.
C. $\int{\left( {{3}^{x}}+2x \right)dx}={{3}^{x}}+{{x}^{2}}+C$.
D. $\int{\left( {{3}^{x}}+2x \right)dx}={{3}^{x}}\ln 3+\dfrac{{{x}^{2}}}{2}+C$.
Ta có $\int{\left( {{3}^{x}}+2x \right)dx}=\dfrac{{{3}^{x}}}{\ln 3}+{{x}^{2}}+C$.
Đáp án B.
