解:11/12÷(11/12+7/6) =11/12÷(11/12+14/12)=11/12÷25/12=11/12×12/25=11/25
=11/12÷11/12+11/12÷14/12=1+11/14=25/14
11/12÷(11/12+7/6)=11/12÷11/12+11/12÷7/6=1+11/12÷7/6=1+11/12×6/7=1+11/14=14/14+11/14=25/14