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[tex]2\frac{1}{3}-1\frac{1}{8}=2\frac{1\cdot8}{3\cdot8}-1\frac{1\cdot3}{8\cdot3}=2\frac{8}{24}-1\frac{3}{24}=1\frac{5}{24}\\\\5\frac{3}{20}-1,35=5\frac{3\cdot5}{20\cdot5}-1,35=5\frac{15}{100}-1,35=5,15-1,35=4,8\\\\4-1\frac{3}{7}=3\frac{7}{7}-1\frac{3}{7}=2\frac{4}{7}\\\\5-0,45=5-\frac{45}{100}=5-\frac{45:5}{100:5}=5-\frac{9}{20}=4\frac{20}{20}-\frac{9}{20}=4\frac{11}{20}[/tex]
