Thực hiện phép tính (a) A = 1 2/3 − 4/3 + 7/2 .

a) \(A = 1\frac{2}{3} - \frac{4}{3} + \frac{7}{2}\)\( = 1\frac{2}{3} - 1\frac{1}{3} + 3\frac{1}{2}\)\( = \left( {1 - 1 + 3} \right) + \left( {\frac{2}{3} - \frac{1}{3} + \frac{1}{2}} \right)\)\( = 3 + \left( {\frac{1}{3} + \frac{1}{2}} \right) = 3\frac{5}{6}\).

b) \(B = \frac{7}{{36}} + \left( {\frac{{29}}{{36}} - \frac{3}{5}} \right) + \frac{8}{5}\)\( = \frac{7}{{36}} + \frac{{29}}{{36}} - \frac{3}{5} + \frac{8}{5}\)\( = 1 + 1 = 2\).

c) \(C = \frac{{ - 20}}{{23}} + \frac{5}{3} + \frac{{ - 3}}{{23}} - \frac{2}{5}\)\( = - 1 + \frac{5}{3} - \frac{2}{5} = \frac{{ - 15 + 25 - 6}}{{15}} = \frac{4}{{15}}\).