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[tex]\frac{1}{4}:2\frac{2}{3}+5:2\frac{1}{2}=\frac{1}{4}:\frac{8}{3}+5:\frac{5}{2}=\frac{1}{4}\cdot\frac{3}{8}+5\cdot\frac{2}{5}=\frac{3}{32}+2=2\frac{3}{32}\\\\2\frac{2}{5}:(4-3\frac{3}{5})=\frac{12}{5}:(3\frac{5}{5}-3\frac{3}{5})=\frac{12}{5}:\frac{2}{5}=\frac{12}{5}\cdot\frac{5}{2}=6\\\\(2\frac{2}{3}+4\frac{2}{3}):3\frac{2}{3}=6\frac{4}{3}:\frac{11}{3}=\frac{22}{3}\cdot\frac{3}{11}=2[/tex]