60. Вычислите: \(2\frac13+\frac49\cdot3\frac38-1\frac67:\frac{26}{63}\).

\[2\frac13=\frac73,\quad 3\frac38=\frac{27}{8},\quad 1\frac67=\frac{13}{7}.\]

\[\frac73+\frac49\cdot\frac{27}{8}-\frac{13}{7}:\frac{26}{63}=\frac73+\frac32-\frac{13}{7}\cdot\frac{63}{26}.\]

\[\frac{13}{7}\cdot\frac{63}{26}=\frac92,\quad \frac73+\frac32-\frac92=\frac73-3=-\frac23.\]

Ответ: \(-\frac23\).