异分母分数的加减法法则是先通分再加减。
11/12-5/16+1/4
=44/48-15/48+12/48
=(44-15+12)/48
=41/48。
原式=11/12+3/12-5/16
=14/12-5/16
=（56-15）/48
=41/48.
11/12-5/16+1/4
=44/48-15/48+12/48
=41/48
=44/48—15/48+12/48
=29/48+12/48
=41/48
11/12-5/16+1/4
=11/12-5/16+4/16
=11/12-1/16
=44/48-3/48
=41/48
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