下面各题怎样算简便就怎样算4/7+1/6-4/7 2-7/9-2/9 3/5+7/8+2/5 7/9-{1/9+1/3}1/4+{2/5+3/4} 5/6-3/10+1/6-
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解：4/7+1/6-4/7
=4/7-4/7+1/6
=1/6
2-7/9-2/9
= 2-（7/9+2/9）
=2-1
=1
3/5+7/8+2/5
= 3/5+2/5+7/8
=1+7/8
=1又7/8
7/9-{1/9+1/3}
=7/9-1/9-1/3
=6/9-1/3
=2/3-1/3
=1/3
1/4+{2/5+3/4}
=1/4+3/4+2/5
=1+2/5
=1又2/5
5/6-3/10+1/6
=5/6+1/6-3/10
=1-3/10
=7/10
=4/7-4/7+1/6
=1/6
2-7/9-2/9
= 2-（7/9+2/9）
=2-1
=1
3/5+7/8+2/5
= 3/5+2/5+7/8
=1+7/8
=1又7/8
7/9-{1/9+1/3}
=7/9-1/9-1/3
=6/9-1/3
=2/3-1/3
=1/3
1/4+{2/5+3/4}
=1/4+3/4+2/5
=1+2/5
=1又2/5
5/6-3/10+1/6
=5/6+1/6-3/10
=1-3/10
=7/10
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