(i) \(\frac{25\times 2}{8\times 5}-\frac{3\times -10}{5\times 9}\)

= \(\frac{50}{40}+\frac{30}{45}\)

= \(\frac{5}{4}+\frac{2}{3}\)

= \(\frac{15+8}{12}\)

= \(\frac{23}{12}\)

 (ii) \(\frac{1\times 1}{2\times 4}+\frac{1\times 6}{2\times 1}\)

= \(\frac{1}{8}+\frac{6}{2}\)

= \(\frac{1}{8}+3\)

= \(\frac{1+24}{8}\)

= \(\frac{25}{8}\)

 (iii) \(\frac{-5\times 2}{1\times 15}+\frac{6\times 2}{1\times 9}\)

= \(\frac{-10}{15}+\frac{12}{9}\)

= \(\frac{-2}{3}+\frac{4}{3}\)

= \(\frac{-2+4}{3}\)

= \(\frac{2}{3}\)

 (iv) \(\frac{-9\times 5}{4\times 3}+\frac{13\times 5}{2\times 6}\)

= \(\frac{-45}{12}+\frac{65}{12}\)

= \(\frac{-45+65}{12}\)

= \(\frac{20}{12}\)

= \(\frac{5}{3}\)

(v) \(\frac{-4\times 12}{3\times -5}+\frac{3\times 21}{7\times 15}\)

= \(\frac{4\times 4}{1\times 5}+\frac{1\times 3}{1\times 5}\)

= \(\frac{16}{5}+\frac{3}{5}\)

= \(\frac{19}{5}\)

(vi) \(\frac{13\times 8}{5\times 3}+\frac{5\times 11}{2\times 3}\)

= \(\frac{104}{15}+\frac{15}{6}\)

 = \(\frac{104\times 2+55\times 6}{30}\)

= \(\frac{483}{30}\)

(vii) \(\frac{13\times 11}{7\times 26}+\frac{4\times 5}{3\times 6}\)

= \(\frac{1\times 11}{7\times 2}+\frac{4\times 5}{3\times 6}\)

 = \(\frac{11}{14}+\frac{20}{18}\)

 = \(\frac{11\times 9+20\times 7}{126}\)

= \(\frac{99+140}{126}\)

= \(\frac{239}{126}\)

(viii) \(\frac{8\times -3}{5\times 2}-\frac{3\times 11}{10\times 16}\)

= \(\frac{-24}{10}-\frac{33}{160}\)

= \(\frac{-24\times 16-33\times 1}{160}\)

= \(\frac{-384-33}{160}\)

= \(\frac{-417}{160}\)