Google
Câu hỏi: Nếu $\int\limits_{1}^{2}{f\left( x \right)dx}=3$ thì $\int\limits_{1}^{2}{\left[ f\left( x \right)+4{{x}^{3}} \right]dx}$ bằng
A. $18$.
B. $12$.
C. $20$.
D. $10$.
A. $18$.
B. $12$.
C. $20$.
D. $10$.
Ta có: $\int\limits_{1}^{2}{\left[ f\left( x \right)+4{{x}^{3}} \right]dx}=\int\limits_{1}^{2}{f\left( x \right)dx}+\int\limits_{1}^{2}{4{{x}^{3}}dx}=3+15=18$.
Đáp án A.