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Câu hỏi: Tìm nguyên hàm của hàm số $f\left( x \right)={{7}^{x}}$.
A. $\int{{{7}^{x}}\text{d}x}=\dfrac{{{7}^{x}}}{\ln x}+C$.
B. $\int{{{7}^{x}}\text{d}x}={{7}^{x+1}}+C$.
C. $\int{{{7}^{x}}\text{d}x}={{7}^{x}}\ln x+C$.
D. $\int{{{7}^{x}}\text{d}x}=\dfrac{{{7}^{x+1}}}{x+1}+C$.
A. $\int{{{7}^{x}}\text{d}x}=\dfrac{{{7}^{x}}}{\ln x}+C$.
B. $\int{{{7}^{x}}\text{d}x}={{7}^{x+1}}+C$.
C. $\int{{{7}^{x}}\text{d}x}={{7}^{x}}\ln x+C$.
D. $\int{{{7}^{x}}\text{d}x}=\dfrac{{{7}^{x+1}}}{x+1}+C$.
Ta có: $\int{{{7}^{x}}\text{d}x}=\dfrac{{{7}^{x}}}{\ln x}+C$.
Đáp án A.