7/26 : -2/13 + -5/18 × 6/5 21/45:16/9+-4/17×34/3 -25/18:15/12-13/21×7/2 Giúp mk vs nha mk đg cần gấp Ghi rõ phương trình giải cho mk vs nha

\(\begin{array}{l}\frac{7}{{26}}:\left( {\frac{{ – 2}}{{13}}} \right) – \frac{5}{{18}}.\frac{6}{5}\\ = \frac{7}{{26}} \times \frac{{ – 13}}{2} – \frac{1}{3}\\ = \frac{{ – 7}}{4} – \frac{1}{3}\\ = \frac{{ – 25}}{{12}}\end{array}\)

\(\begin{array}{l}\frac{{21}}{{45}}:\frac{{16}}{9} + \left( {\frac{{ – 4}}{{17}}} \right).\frac{{34}}{3}\\ = \frac{{21}}{{45}} \times \frac{9}{{16}} – \frac{8}{3}\\ = \frac{{21}}{{80}} – \frac{8}{3}\\ = \frac{{ – 577}}{{240}}\end{array}\)

\(\frac{{ – 25}}{{18}}:\frac{{15}}{{12}} – \frac{{13}}{{21}}.\frac{7}{2} = \frac{{ – 25}}{{18}} \times \frac{{12}}{{15}} – \frac{{13}}{6} = \frac{{ – 10}}{9} – \frac{{13}}{6} = \frac{{ – 59}}{{18}}\)