[tex] a)\frac{3 + 7}{10} = \frac{10}{10} = 1 \\ b) \: \frac{30 - 8}{11} = \frac{22}{11} \\ c)aduci \: la \: acelasi \: numitor \: \frac{5}{18} + \frac{2 \times7}{9 \times 2} - \frac{3 \times 1}{6 \times 1} = \frac{5 + 14 - 3}{18} = \frac{16}{18} = se \: simplifica = \frac{8}{9} \\ d)se \: simplifica \: \: \frac{5 \times 7 \times 12}{6 \times 15 \times 49} = \frac{1 \times 1 \times 2}{1 \times 3 \times7 } = \frac{2}{21} \\ e) \frac{25 }{8} \div \frac{35}{4} = \frac{25}{8} \times \frac{4}{35} = \frac{5}{2 \times 7} = \frac{5}{14} \\ f) \frac{5 \times 6}{13} - \frac{2 \times 6}{13 \times 3} = \frac{24}{13} \\ g) \frac{ 3}{7} \times 21 = 3 \times 3 = 9 \\ h) \frac{30}{100} \times 120 = 3 \times 12 = 36 \\ i) \frac{7}{6} ( \frac{11}{6} - ( \frac{4 + 1}{6} ) \times \frac{7}{15}) = \frac{7}{6} ( \frac{33}{18} - \frac{7}{18} ) = \frac{7 \times 26}{6 \times 18} = \frac{91}{54} \\ 2)50 + \frac{50 \times 20}{100} = 50 + 10 = 60 \\ 3) \frac{40 \times 300}{100} = 120 \\ 300 - 120 = 180 \\ \frac{7 \times 180}{9} = 140 \\ 180 - 140 = 40[/tex]
