计算下面各题,注意使用计算简便.

5\6+2\7+1\6
=5/6+1/6+2/7
=1+2/7
=9/7
8\9-1\6+2\3
=16/18-3/18+12/18
=25/18
1\6+5\8+2\8+5\6
=1/6+5/6+(5/8+2/8)
=1+7/8
=15/8
2\3-(1\4+1\8)
2/3+(2/8+1/8)
=2/3+3/8
=16/24+9/24
=25/24
17\8-（7\8+1\4)
=17/8-7/8-1/4
=5/4-1/4
=1
3\4-2\7+1\4-5\7
=3/4+1/4-(2/7+5/7)
=1-1
=0


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