Google
Câu hỏi: Nếu $\int\limits_{0}^{1}{3f\left( x \right)}dx=3$ thì $\int\limits_{0}^{1}{f\left( x \right)}dx$ bằng
A. $1$.
B. $18$.
C. $2$.
D. $3$.
A. $1$.
B. $18$.
C. $2$.
D. $3$.
Ta có $\int\limits_{0}^{1}{3f\left( x \right)}dx=3\int\limits_{0}^{1}{f\left( x \right)}dx=3\Leftrightarrow \int\limits_{0}^{1}{f\left( x \right)}dx=1$.
Đáp án A.