Решение:
a) $$-21 + 13 - 50 - 19 + 37 = -21 + 13 + 37 - 50 - 19 = 50 - 50 - 19 = -19$$
б) $$5\frac{7}{6} \cdot 3\frac{4}{11} : (-1\frac{4}{6}) = \frac{37}{6} \cdot \frac{37}{11} : (-\frac{10}{6}) = \frac{37}{6} \cdot \frac{37}{11} \cdot (-\frac{6}{10}) = -\frac{37 \cdot 37 \cdot 6}{6 \cdot 11 \cdot 10} = -\frac{37 \cdot 37}{11 \cdot 10} = -\frac{1369}{110} = -12\frac{49}{110}$$
Ответы:
a) **-19**
б) **$$-12\frac{49}{110}$$**