Вычислите а) 1/6 + 1/9 б) 2/9 + 5/6 в) 2/9 + 3/8 г) 2/10+6/15 д) 3/10+2/12 е) 5/12+4/15...

а)

$\frac{1}{6} + \frac{1}{9} = \frac{3 + 2}{18} = \frac{5}{18}$

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б)

$\frac{2}{9} + \frac{5}{6} = \frac{4 + 15}{18} = \frac{19}{18} = 1 \frac{1}{18}$

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в)

$\frac{2}{9} + \frac{3}{8} = \frac{16 + 27}{72} = \frac{43}{72}$

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г)

$\frac{2}{10} + \frac{6}{15} = \frac{1 + 2}{5} = \frac{3}{5}$

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д)

$\frac{3}{10} + \frac{2}{12} = \frac{3}{10} + \frac{1}{6} = \frac{9 + 5}{30} = \frac{14}{30} = \frac{7}{15}$

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е)

$\frac{5}{12} + \frac{4}{15} = \frac{25 + 16}{60} = \frac{41}{60}$