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16)
$\frac{5}{16} \div ( - \frac{25}{4} ) + 2.05 = - \frac{5}{16} \times \frac{4}{25} + \frac{205}{100} = - \frac{1 \times 1}{4 \times 5} + \frac{41}{20} = - \frac{1}{20} + \frac{41}{20} = \frac{40}{20} = 2$
17)
$\frac{1}{7} \div ( - \frac{5}{21} ) + 4.6 = - \frac{1}{7} \times \frac{21}{5} + \frac{46}{10} = - \frac{1 \times 3}{1 \times 5} + \frac{23}{5} = - \frac{3}{5} + \frac{23}{5} = \frac{20}{5} = 4$
18)
$\frac{2}{3} \div ( - \frac{10}{9} ) + 0.6 = - \frac{2}{3} \times \frac{9}{10} + \frac{6}{10} = - \frac{1 \times 3}{1 \times 5} + \frac{3}{5} = - \frac{3}{5} + \frac{3}{5} = 0$
19)
$\frac{4}{11} \div ( - \frac{16}{33} ) + 5.75 = - \frac{4}{11} \times \frac{33}{16} + 5 \frac{3}{4} = - \frac{1 \times 3}{1 \times 4} + \frac{23}{4} = - \frac{3}{4} + \frac{23}{4} = \frac{20}{4} = 5$