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[tex]2\frac{7}{8}+1\frac{5}{6}=2\frac{7\cdot3}{8\cdot3}+1\frac{5\cdot4}{6\cdot4}=2\frac{21}{24}+1\frac{20}{24}=3\frac{41}{24}=4\frac{17}{24}\\\\3\frac{4}{9}+1\frac{5}{6}=3\frac{4\cdot2}{9\cdot2}+1\frac{5\cdot3}{6\cdot3}=3\frac{8}{18}+1\frac{15}{18}=4\frac{23}{18}=5\frac{5}{18}[/tex]
