Определим предмет: математика, необходимо вычислить значения выражений.
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$$\frac{11}{12} - (\frac{1}{3} + \frac{1}{4}) = $$
$$\frac{11}{12} - (\frac{4}{12} + \frac{3}{12}) =$$
$$\frac{11}{12} - \frac{7}{12} = \frac{4}{12} = \frac{1}{3}$$
$$\frac{11}{12} - (\frac{1}{3} + \frac{1}{4}) = \frac{1}{3}$$
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$$\frac{7}{24} + (\frac{1}{2} + \frac{1}{2}) = $$
$$\frac{7}{24} + 1 = 1\frac{7}{24}$$
$$\frac{7}{24} + (\frac{1}{2} + \frac{1}{2}) = 1\frac{7}{24}$$
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$$\frac{7}{15} - (\frac{2}{3} - \frac{1}{5}) =$$
$$\frac{7}{15} - (\frac{10}{15} - \frac{3}{15}) =$$
$$\frac{7}{15} - \frac{7}{15} = 0$$
$$\frac{7}{15} - (\frac{2}{3} - \frac{1}{5}) = 0$$
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$$\frac{13}{21} + (\frac{2}{3} - \frac{3}{7}) =$$
$$\frac{13}{21} + (\frac{14}{21} - \frac{9}{21}) =$$
$$\frac{13}{21} + \frac{5}{21} = \frac{18}{21} = \frac{6}{7}$$
$$\frac{13}{21} + (\frac{2}{3} - \frac{3}{7}) = \frac{6}{7}$$