Question

Va rog urgent dau coroana

Answer 1

$\frac{8}{9} - \frac{7}{8} = \frac{8 \times 8 - 7 \times 9}{72} = \frac{64 - 63}{72} = \frac{1}{72}$
$\frac{5}{6} - \frac{2}{3} = \frac{5 - 2 \times 2}{6} = \frac{5 - 4}{6} = \frac{1}{6}$
$\frac{6}{5} - \frac{6}{7} = \frac{7 \times 6 - 5 \times 6}{35} = \frac{42 - 30}{35} = \frac{12}{35}$
$\frac{3}{8} + \frac{4}{6} = \frac{6 \times 3 + 8 \times 4}{48} = \\ \frac{18 + 32}{48} = \frac{50}{48} \div 2 = \frac{25}{24}$
$\frac{5}{2} - \frac{2}{3} = \frac{3 \times 5 - 2 \times 2}{6} = \frac{15 - 4}{6} = \frac{11}{6}$
$\frac{5}{6} + \frac{6}{7} = \frac{7 \times 5 + 6 \times 6}{42} = \\ \frac{35 + 36}{42} = \frac{71}{42}$
$\frac{2}{3} + \frac{3}{4} = \frac{4 \times 2 + 3 \times 3}{12} \\ = \frac{8 + 9}{12} = \frac{17}{12}$

$\frac{5}{3} - \frac{3}{4} = \frac{4 \times 5 - 3 \times 3}{12} = \\ \frac{20 - 9}{12} = \frac{11}{12}$