[tex]2\frac45+\frac14=2\frac{16}{20}+\frac5{20}=2\frac{21}{20}=3\frac1{20}\\\\ 2\frac29\cdot1\frac35=\frac{20}{9}\cdot\frac85=\frac49\cdot\frac81= \frac{32}9=3\frac59 \\\\2\frac23:1\frac15=\frac83:\frac65=\frac83\cdot\frac56= \frac43\cdot\frac53=\frac{20}9=2\frac29[/tex]
