Google
Câu hỏi: Nếu $\int\limits_{1}^{4}{f\left( x \right)}dx=12$ và $\int\limits_{4}^{6}{f\left( x \right)}dx=-8$ thì $\int\limits_{1}^{6}{f\left( x \right)}dx$ bằng
A. $-4$.
B. $4$.
C. $\dfrac{7}{34}$.
D. $\dfrac{9}{34}$.
A. $-4$.
B. $4$.
C. $\dfrac{7}{34}$.
D. $\dfrac{9}{34}$.
$\int\limits_{1}^{6}{f\left( x \right)}dx=\int\limits_{1}^{4}{f\left( x \right)}dx+\int\limits_{4}^{6}{f\left( x \right)}dx=12+\left( -8 \right)=4$.
Đáp án B.