Tính các tích phân sau: a) tích phân 0 1 |2x-1| dx; b) tích phân - 2 3 |x - 1| dx

a) \(\int\limits_0^2 {\left| {2x - 1} \right|dx} \) = \(\int\limits_0^{\frac{1}{2}} {\left| {2x - 1} \right|dx} + \int\limits_{\frac{1}{2}}^2 {\left| {2x - 1} \right|dx} \)

                       = \(\int\limits_0^{\frac{1}{2}} {\left( {1 - 2x} \right)dx} + \int\limits_{\frac{1}{2}}^2 {\left( {2x - 1} \right)dx} \)

                       = \(\left. {\left( {x - {x^2}} \right)} \right|_0^{\frac{1}{2}} + \left. {\left( {{x^2} - x} \right)} \right|_{\frac{1}{2}}^2\) = \(\frac{5}{2}\).

b) \(\int\limits_{ - 2}^3 {\left| {x - 1} \right|dx} \) = \(\int\limits_{ - 2}^1 {\left| {x - 1} \right|dx} + \int\limits_1^3 {\left| {x - 1} \right|dx} \)

                      = \(\int\limits_{ - 2}^1 {\left( {1 - x} \right)dx} + \int\limits_1^3 {\left( {x - 1} \right)dx} \)

                      = \(\left. {\left( {x - \frac{1}{2}{x^2}} \right)} \right|_{ - 2}^1 + \left. {\left( {\frac{1}{2}{x^2} - x} \right)} \right|_1^3\)

                      = 1² − \(\frac{1}{2}\).1² – (−2) + \(\frac{1}{2}\).(−2)² + \(\frac{1}{2}\).3² – 3 − \(\frac{1}{2}\).1² + 1.

                      = \(\frac{{13}}{2}\).