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Thực hiện phép tính (tính hợp lí nếu có thể): a) \(\frac{6}{{13}} + \frac{{ - 17}}{{39}}.\) b) \( - 1,25 - 2\frac{1}{4}.\) c) \(\frac{{ - 15}}{{16}} \cdot \frac{8}{{ - 25}}.\) d) \(\frac{5}{6}:\frac{{ - 7}}{{12}}.\) e) \(\frac{2}{3} - \left( {\frac{{ - 5}}{7} + \frac{2}{3}} \right).\) f) \(\frac{3}{4} - \frac{4}{5} + \frac{{ - 17}}{{20}}.\) g) \(\frac{1}{4} + \frac{3}{4}:\left( { - \frac{6}{7}} \right).\)       h) \[\frac{9}{{11}} - \frac{7}{8} + \frac{{13}}{{11}} + \frac{{ - 1}}{8}.\] i) \[12\frac{5}{{14}} - \left( {3\frac{5}{7} + 5\frac{5}{{14}}} \right).\] j) \(\left( {\frac{{ - 12}}{5} + \frac{5}{{12}} + \frac{1}{4}} \right) + \left( {\frac{7}{5} + \frac{{ - 19}}{{12}} + \frac{2}{{12}}} \right) - {2024^0}.\) k) \[\frac{7}{{12}} \cdot \frac{2}{3} - \frac{5}{3} \cdot \frac{7}{{12}} + \frac{7}{{12}} \cdot 3.\]                                                             l) \(\frac{2}{3}:\frac{4}{5} - \frac{5}{4} + \frac{1}{3}:\frac{4}{5}.\) m) \(\frac{2}{5} \cdot \left( {\frac{{ - 5}}{{12}} + \frac{{ - 9}}{{13}}} \right) - \frac{2}{5} \cdot \left( {\frac{4}{{13}} - \frac{5}{{12}}} \right):2.\)      n) \(\frac{2}{{15}} \cdot \frac{3}{8} - \left( {\frac{7}{{20}} - 75\% } \right):\frac{8}{5}.\) p) \({\left( {\frac{{ - 2}}{5}} \right)^2} + \frac{1}{2} \cdot \left( {4,5 - 2} \right) - 25\% .\)

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