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[tex]2\frac{7}{8}+1\frac{1}{4}=2\frac{7}{8}+1\frac{1\cdot2}{4\cdot2}=2\frac{7}{8}+1\frac{2}{8}=3\frac{9}{8}=4\frac{1}{8}\\\\3\frac{4}{9}+2\frac{1}{3}=3\frac{4}{9}+2\frac{1\cdot3}{3\cdot3}=3\frac{4}{9}+2\frac{3}{9}=5\frac{7}{9}\\\\5\frac{7}{20}-3\frac{2}{5}=5\frac{7}{20}-3\frac{2\cdot4}{5\cdot4}=5\frac{7}{20}-3\frac{8}{20}=4\frac{27}{20}-3\frac{8}{20}=1\frac{19}{20}[/tex]
