Biết \(\displaystyle\int\limits_{1}^2f(x)\mathrm{\,d}x=2\). Tích phân \(\displaystyle\int\limits_{1}^23f(x)\mathrm{\,d}x\) bằng
| \(5\) | |
| \(6\) | |
| \(1\) | |
| \(3\) |
Chọn phương án B.
$$\displaystyle\int\limits_{1}^23 f(x)\mathrm{\,d}x=3\displaystyle\int\limits_{1}^2 f(x)\mathrm{\,d}x=3 \cdot 2=6.$$