Ответ:
Краткое пояснение: Приводим дроби к общему знаменателю и складываем.
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а) \(\frac{1}{4} + \frac{1}{3} = \frac{1*3}{4*3} + \frac{1*4}{3*4} = \frac{3}{12} + \frac{4}{12} = \frac{3+4}{12} = \frac{7}{12}\)
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б) \(\frac{1}{5} + \frac{1}{2} = \frac{1*2}{5*2} + \frac{1*5}{2*5} = \frac{2}{10} + \frac{5}{10} = \frac{2+5}{10} = \frac{7}{10}\)
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в) \(\frac{1}{3} + \frac{1}{7} = \frac{1*7}{3*7} + \frac{1*3}{7*3} = \frac{7}{21} + \frac{3}{21} = \frac{7+3}{21} = \frac{10}{21}\)
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а) \(\frac{2}{3} + \frac{5}{9} = \frac{2*3}{3*3} + \frac{5}{9} = \frac{6}{9} + \frac{5}{9} = \frac{6+5}{9} = \frac{11}{9}\)
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б) \(\frac{3}{8} + \frac{1}{2} = \frac{3}{8} + \frac{1*4}{2*4} = \frac{3}{8} + \frac{4}{8} = \frac{3+4}{8} = \frac{7}{8}\)
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в) \(\frac{1}{14} + \frac{3}{7} = \frac{1}{14} + \frac{3*2}{7*2} = \frac{1}{14} + \frac{6}{14} = \frac{1+6}{14} = \frac{7}{14} = \frac{1}{2}\)
Ответ: