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16)
$\frac{19}{25} \div ( - 0 .38) + \frac{7}{10} = - \frac{19}{25} \div \frac{38}{100} + \frac{7}{10} = - \frac{19}{25} \times \frac{100}{38} + \frac{7}{10} = - \frac{1 \times 4}{1 \times 2} + \frac{7}{10} = - 2 + 0.7 = - 1.3$
17)
$\frac{17}{20} \div ( - 0.51) + \frac{2}{3} = - \frac{17}{20} \div \frac{51}{100} + \frac{2}{3} = - \frac{17}{20} \times \frac{100}{51} + \frac{2}{3} = - \frac{1 \times 5}{1 \times 3} + \frac{2}{3} = - \frac{5}{3} + \frac{2}{3} = - \frac{ 3}{3} = - 1$
18)

$\frac{11}{25} \div ( - 0.22) + \frac{3}{5} = - \frac{11}{25} \div \frac{22}{100} + \frac{3}{5} = - \frac{11}{25} \times \frac{100}{22} + \frac{3}{5} = - \frac{1 \times 4}{1 \times 2} + \frac{3}{5} = - 2 + \frac{3}{5} = - 2 + \frac{6}{10} = - 2 + 0.6 = - 1.4$
19)
$\frac{7}{12} \div ( - 0.14) + \frac{1}{6} = - \frac{7}{12} \div \frac{14}{100} + \frac{1}{6} = - \frac{7}{12} \times \frac{100}{14} + \frac{1}{6} = - \frac{1 \times 25}{3 \times 2} + \frac{1}{6} = - \frac{25}{6} + \frac{1}{6} = - \frac{24}{6} = - 4$