Ответ:
- \[2\frac{1}{3}+1\frac{1}{4}=\frac{7}{3}+\frac{5}{4}=\frac{28+15}{12}=\frac{43}{12}=3\frac{7}{12}.\]
- \[3\frac{2}{5}-1\frac{3}{4}=\frac{17}{5}-\frac{7}{4}=\frac{68-35}{20}=\frac{33}{20}=1\frac{13}{20}.\]
- \[1\frac{1}{2}\cdot2\frac{2}{3}=\frac{3}{2}\cdot\frac{8}{3}=4.\]
- \[4\frac{1}{2}:1\frac{1}{2}=\frac{9}{2}:\frac{3}{2}=3.\]
