计算题??

如题所述

4/5+11/15+3/10
=23/15+3/10
=11/6

2又3/4-4/7-3/7
=2又3/4-(4/7+3/7)
=2又3/4-1
=1又3/4

5/12+4/9+5/9+1/12
=(5/12+1/12)+(4/9+5/9)
=1/2+1
=1又1/2

2/3-(2/15+1/5)
=2/3-1/3
=1/3
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