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Câu hỏi: Cho hàm số $f\left( x \right)={{x}^{4}}+{{x}^{2}}$. Trong các khẳng đinh sau, khằng định nào đúng?
A. $\int{f\left( x \right)dx=}$ $\dfrac{1}{5}{{x}^{5}}+\dfrac{1}{3}{{x}^{3}}+C$
B. $\int{f\left( x \right)dx=}$ ${{x}^{4}}+{{x}^{2}}+C$
C. $\int{f\left( x \right)dx=}$ ${{x}^{5}}+{{x}^{3}}+C$.
D. $\int{f\left( x \right)dx=}$ $4{{x}^{3}}+2x+C$
A. $\int{f\left( x \right)dx=}$ $\dfrac{1}{5}{{x}^{5}}+\dfrac{1}{3}{{x}^{3}}+C$
B. $\int{f\left( x \right)dx=}$ ${{x}^{4}}+{{x}^{2}}+C$
C. $\int{f\left( x \right)dx=}$ ${{x}^{5}}+{{x}^{3}}+C$.
D. $\int{f\left( x \right)dx=}$ $4{{x}^{3}}+2x+C$
$\int{f\left( x \right)dx=}$ $\int{\left( {{x}^{4}}+{{x}^{2}} \right)dx}$ $=\dfrac{1}{5}{{x}^{5}}+\dfrac{1}{3}{{x}^{3}}+C$.
Đáp án A.