Вичислите наиболее удобным способом. А) 8/9+14/27+1/9 б) (3/17+8/102)+14/17 в)...

А)

$\frac{8}{9} + \frac{14}{27} + \frac{1}{9} = \frac{8 + 1}{9} + \frac{14}{27} = 1 + \frac{14}{27} = 1 \frac{14}{27}$

б)
$( \frac{3}{17} + \frac{8}{102} ) + \frac{14}{17} = \frac{3 + 14}{17} + \frac{8}{102} = 1 + \frac{4}{51} = 1 \frac{4}{51}$

в)
$( \frac{1}{33} + 311) + \frac{2}{11} = 311 \frac{1 + 2 \times 3}{11 \times 3} = 311 \frac{7}{33}$
или
$( \frac{1}{ 33} + \frac{3}{11} ) + \frac{2}{11} = \frac{1}{33} + \frac{3 + 2}{11} = \frac{1}{33} + \frac{5}{11} = \frac{1 + 5 \times 3}{33} = \frac{16}{33}$

г)

$\frac{2}{5} + ( \frac{1}{20} + \frac{4}{5} ) = \frac{2 + 4}{5} + \frac{1}{20} = \frac{6}{5} + \frac{1}{20} = 1 \frac{1}{5} + \frac{1}{20} = 1 \frac{4 + 1}{20} = 1 \frac{5}{20} = 1 \frac{1}{4}$