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Розв'язок:
1) $-2\frac{1}{8} : 4\frac{1}{4} = -\frac{17}{8} : \frac{17}{4} = $
$=-\frac{17}{8} \cdot \frac{4}{17} = -\frac{1 \cdot 1}{2 \cdot 1} = -\frac{1}{2}$
2) $1\frac{8}{27} : (-1\frac{5}{9}) = \frac{35}{27} : (-\frac{14}{9}) = $
$=\frac{35}{27} \cdot (-\frac{9}{14}) = -\frac{5 \cdot 1}{3 \cdot 2} = -\frac{5}{6}$
3) $-11\frac{2}{5} : (-3\frac{4}{5}) = -\frac{57}{5} : (-\frac{19}{5}) = $
$=\frac{57}{5} \cdot \frac{5}{19} = \frac{3 \cdot 1}{1 \cdot 1} = 3$
4) $-4\frac{2}{7} : 1\frac{19}{21} = -\frac{30}{7} : \frac{40}{21} = $
$-\frac{30}{7} \cdot \frac{21}{40} = -\frac{3 \cdot 3}{1 \cdot 4} = -\frac{9}{4} = -2\frac{1}{4}$