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Câu hỏi: Nếu $\int{f\left( x \right)\text{d}x=\dfrac{{{x}^{3}}}{3}+{{\text{e}}^{x}}+C}$ thì $f\left( x \right)$ bằng
A. $3{{x}^{2}}+{{\text{e}}^{x}}$.
B. ${{x}^{2}}+{{\text{e}}^{x}}$.
C. $\dfrac{{{x}^{4}}}{12}+{{\text{e}}^{x}}$.
D. $\dfrac{{{x}^{4}}}{3}+{{\text{e}}^{x}}$.
A. $3{{x}^{2}}+{{\text{e}}^{x}}$.
B. ${{x}^{2}}+{{\text{e}}^{x}}$.
C. $\dfrac{{{x}^{4}}}{12}+{{\text{e}}^{x}}$.
D. $\dfrac{{{x}^{4}}}{3}+{{\text{e}}^{x}}$.
Xét $\left( \dfrac{{{x}^{3}}}{3}+{{\text{e}}^{x}}+c \right)'={{x}^{2}}+{{\text{e}}^{x}}$.
Đáp án B.