помогите пж
[tex] \frac{1}{9} + \frac{4}{9} [/tex]
[tex] \frac{7}{8 } - \frac{3}{8} [/tex]
[tex] \frac{2}{5} + \frac{3}{5} [/tex]
[tex] \frac{3}{7} - \frac{2}{7} [/tex]
[tex] \frac{7}{20} - \frac{3}{20} [/tex]

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