5/6+3/4-1/3=20/24+18/24+1/3=36/24+1/3=3/2+1/3=9/6+2/6=11/6=1又5分之6
原式
=5/6+3/4-1/3
=10/12+9/12-4/12
=19/12-4/12
=15/12
=5/4
=1 又1/4
那就是
=5/6-2/6+3/4
=3/6+3/4
=2/4+3/4
=5/4
=1又1/4
5/6+3/4-1/3
=5/6+9/12-4/12
=5/6+5/12
=10/12+5/12
=15/12
=5/4
十二分之15=15/12=5/4