Explicación paso a paso:
[tex] \frac{1}{6} + \frac{2}{9} = \frac{(1 \times 9) +(6 \times 2) }{6 \times 9} = \frac{9 + 12}{54} = \frac{21}{54} = \frac{7}{18} [/tex]
[tex] \frac{3}{4} + \frac{1}{6} = \frac{(3 \times 6) + (4 \times 1)}{6 \times 4} = \frac{18 + 4}{24} = \frac{22}{24} = \frac{11}{12}[/tex]
