Вычислите:
[tex]
1.\frac{1}{2} + \frac{4}{5}; 2. \frac{3}{4} + \frac{5}{9}; 3. \frac{2}{3} - \frac{1}{4} ; 4. \frac{5}{6}
[tex]
1.\frac{1}{2} + \frac{4}{5}; 2. \frac{3}{4} + \frac{5}{9}; 3. \frac{2}{3} - \frac{1}{4} ; 4. \frac{5}{6}
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