помогите:(
[tex]1) ( \ \frac{7}{15} - \frac{1}{6}) + \frac{2}{5} \\ 2)( \frac{3}{8} - \frac{1}{9} ) + \frac{25}{36} \\ 3)( \frac{8}{9} + \frac{5}{6} ) + \frac{2}{3} \\ 4)( \frac{7}{8 - \frac{13}{20} } ) + \frac{9}{10} \\ 5)( \frac{7}{18} - \frac{1}{12}) + \frac{5}{6} \\ 6)( \frac{3}{4} + \frac{8}{15} ) + \frac{17}{20} [/tex]
Нужно сделать как на доске​
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