∵OM平分∠BOC,ON平分∠AOC,
∴∠COM=1/2∠BOC,∠CON=1/2∠AOC
∴∠MON=∠COM+∠CON=1/2(∠BOC+∠AOC)
=1/2∠AOB=1/2×97°
=48.5°