用简便方法计算 两题
3个回答
2016-02-29
展开全部
8/9-(1/2+2/9)+1/2
=8/9-1/2-2/9+1/2
=8/9-2/9+(1/2-1/2)
=6/9+0
=2/3
17/13-3/8-5/8
=17/13-(3/8+5/8)
=17/13-1
=17/13-13/13
=4/13
=8/9-1/2-2/9+1/2
=8/9-2/9+(1/2-1/2)
=6/9+0
=2/3
17/13-3/8-5/8
=17/13-(3/8+5/8)
=17/13-1
=17/13-13/13
=4/13
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