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В)
$(6 \times \frac{5}{24} + 7 \times \frac{19}{24} ) - 6 \times \frac{19}{23} - 5 \times \frac{9}{23} = ((6 + 7) + ( \frac{5}{24} + \frac{19}{24} )) - \frac{157}{23} - \frac{124}{23} = (13 + 1) - \frac{157}{23} - \frac{124}{23} = 14 - \frac{157}{23} - \frac{124}{23} = \frac{41}{23}$
в)
$(6 \times \frac{7}{12} + 8 \times \frac{5}{12} ) - 7 \times \frac{16}{21} - 4 \times \frac{6}{21} = ((6 + 8) + ( \frac{7}{12} + \frac{5}{12} )) - \frac{163}{21} - \frac{90}{21} = (14 + 1) - \frac{163}{21} - \frac{90}{21} = 15 - \frac{163}{21} - \frac{90}{21} = \frac{62}{21}$
а)