计算下面各题。怎样简便就怎样算。 10
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1/2+2/3-5/6
=7/6-5/6
=1/3
7/10-1/8-3/8
=7/10-(1/8+3/8)
=7/10-1/2
=1/5
3/7+9/10+4/7
=3/7+4/7+9/10
=1+9/10
=1.9
2-(3/4+5/6)
=2-19/12
=5/12
7/10-(3/7-3/10)
=7/10+3/10-3/7
=1-3/7
=4/7
5/6+4/9+1/6+5/9
=(5/6+1/6)+(4/9+5/9)
=1+1
=2
=7/6-5/6
=1/3
7/10-1/8-3/8
=7/10-(1/8+3/8)
=7/10-1/2
=1/5
3/7+9/10+4/7
=3/7+4/7+9/10
=1+9/10
=1.9
2-(3/4+5/6)
=2-19/12
=5/12
7/10-(3/7-3/10)
=7/10+3/10-3/7
=1-3/7
=4/7
5/6+4/9+1/6+5/9
=(5/6+1/6)+(4/9+5/9)
=1+1
=2
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