Ответ:
\[\frac{16}{15}:\frac25=\frac{16}{15}\cdot\frac52=\frac83,\quad 2\frac1{12}\cdot\frac45=\frac{25}{12}\cdot\frac45=\frac53.\]
\[\frac83-6\frac13+\frac53=\frac83-\frac{19}{3}+\frac53=\frac{8-19+5}{3}=-2.\]
Ответ: \(-2\).
\[\frac{16}{15}:\frac25=\frac{16}{15}\cdot\frac52=\frac83,\quad 2\frac1{12}\cdot\frac45=\frac{25}{12}\cdot\frac45=\frac53.\]
\[\frac83-6\frac13+\frac53=\frac83-\frac{19}{3}+\frac53=\frac{8-19+5}{3}=-2.\]
Ответ: \(-2\).