3/4一1/12=,5/6+7/18=,5/6一1/4=,3/5一1/10=
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解: 3/4-1/12
=(9-1)/12
=8/12
=2/3
5/6+7/18
=15/18+7/18
=22/18
=11/9
5/6-1/4
=10/12-3/12
=7/12
3/5-1/10
=6/10-1/10
=5/10
=1/2
