用简便方法计算 （+3-3/4）+（-5 2/3）+（-6）（-2/3）-（-
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1:
18/11-(16/17-4/11)
=18/11-16/17+4/11
=18/11+4/11-16/17
=22/11-16/17
=2-16/17
=18/17
2:
4/5-(13/16-5/16)+3/4
=4/5-8/16+3/4
=4/5-1/2+3/4
==4/5+1/4
=21/20
3:
1/2+2/5-3/10+0.6
=0.5+0.4-0.3+0.6
=1.2
18/11-(16/17-4/11)
=18/11-16/17+4/11
=18/11+4/11-16/17
=22/11-16/17
=2-16/17
=18/17
2:
4/5-(13/16-5/16)+3/4
=4/5-8/16+3/4
=4/5-1/2+3/4
==4/5+1/4
=21/20
3:
1/2+2/5-3/10+0.6
=0.5+0.4-0.3+0.6
=1.2
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