Thực hiện phép tính: câu a) 25/39 . -3/5                  câu b) 7/5 - 4/3 + (-2/5)    câu c) căn 1 11/25 . |-7/3| +1 1/5 . 11/3 - 1 1/5 + 0.125^0

a.

\(\frac{{25}}{{39}}.\left( { - \frac{3}{5}} \right) = \frac{{25.( - 3)}}{{39.5}} = \frac{{5.( - 1)}}{{13.1}} = \frac{{ - 5}}{{13}}\)b.\(\frac{7}{5} - \frac{4}{3} + \left( { - \frac{2}{5}} \right) = \left[ {\frac{7}{5} + \left( { - \frac{2}{5}} \right)} \right] - \frac{4}{3} = 1 - \frac{4}{3} = - \frac{1}{3}\)c. 

\(\sqrt {1\frac{{11}}{{25}}} .\left| {\frac{{ - 7}}{3}} \right| + 1\frac{1}{5}.\frac{{11}}{3} - 1\frac{1}{5} + {(0,125)^0} = \sqrt {\frac{{36}}{{25}}} .\frac{7}{3} + \frac{6}{5}.\frac{{11}}{3} - \frac{6}{5} + 1\)

                                                      \( = \frac{6}{5}.\left( {\frac{7}{3} + \frac{{11}}{3} - 1} \right) + 1 = 6 + 1 = 7\)