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$3)16 \frac{1}{3} -11 \frac{3}{7} *( \frac{1}{10} + \frac{2}{15})=16 \frac{1}{3} -11 \frac{3}{7} *( \frac{3}{30} + \frac{4}{30})= 16 \frac{1}{3} -11 \frac{3}{7} * \frac{7}{30} = \\ 16 \frac{1}{3} - \frac{80}{7} *\frac{7}{30} =16 \frac{1}{3}-2 \frac{2}{3} =15 \frac{4}{3}-2 \frac{2}{3}=13 \frac{2}{3} \\ 4)(5 \frac{3}{8} +18 \frac{1}{2}-7 \frac{5}{24} ):16 \frac{2}{3} =(5 \frac{9}{24} +18 \frac{12}{24}-7 \frac{5}{24} ): 16\frac{2}{3} =16 \frac{16}{24} :16 \frac{2}{3} = \\$
$16 \frac{2}{3}:16 \frac{2}{3}=1 \\$