Cho \limits_1^2 {f( x )dx} = {1}{2},limits_3^4 {f( x )dx} = {3}{4}\).

3/22

Cho \(\int\limits_1^2 {f\left( x \right)dx} = \frac{1}{2},\int\limits_3^4 {f\left( x \right)dx} = \frac{3}{4}\). Kết quả \(\int\limits_1^4 {f\left( x \right)dx} - \int\limits_2^3 {f\left( x \right)dx} \) bằng

\(\frac{3}{8}\).

\(\frac{5}{4}\).

\(\frac{5}{8}\).

\(\frac{1}{4}\).

Giải thích

Đáp án đúng là: B

\(\int\limits_1^4 {f\left( x \right)dx} - \int\limits_2^3 {f\left( x \right)dx} \)\( = \int\limits_1^2 {f\left( x \right)dx + \int\limits_2^3 {f\left( x \right)dx} } - \int\limits_2^3 {f\left( x \right)dx} + \int\limits_3^4 {f\left( x \right)dx} \)\( = \frac{1}{2} + \frac{3}{4} = \frac{5}{4}\).