Выполните действия.
а) $\frac{107}{111} - \frac{75}{111} - \frac{12}{111}$
б) $\frac{132}{163} - \frac{17}{163} - \frac{75}{163}$
в) $\frac{62}{103} - \frac{37}{103} - \frac{15}{103}$
г) $\frac{100}{187} - \frac{43}{187} - \frac{37}{187}$

$\frac{107}{111} - \frac{75}{111} - \frac{12}{111} = \frac{107}{111} - (\frac{75}{111} + \frac{12}{111}) = \frac{107}{111} - \frac{87}{111} = \frac{20}{111}$
$\frac{132}{163} - \frac{17}{163} - \frac{75}{163} = \frac{132}{163} - (\frac{17}{163} + \frac{75}{163}) = \frac{132}{163} - \frac{92}{163} = \frac{40}{163}$
$\frac{62}{103} - \frac{37}{103} - \frac{15}{103} = \frac{62}{103} - (\frac{37}{103} + \frac{15}{103}) = \frac{62}{103} - \frac{52}{103} = \frac{10}{103}$
$\frac{100}{187} - \frac{43}{187} - \frac{37}{187} = \frac{100}{187} - (\frac{43}{187} + \frac{37}{187}) = \frac{100}{187} - \frac{80}{187} = \frac{20}{187}$