用简便算法计算
展开全部
1-3/7+5/14
=1-6/14+5/14
=1-1/14
=13/14,
1-3/5-2/5
=1-(3/5+2/5)
=1-1
=0,
4/5-3/10+2/3
=8/10-3/10+2/3
=1/2+2/3
=7/6.
=1-6/14+5/14
=1-1/14
=13/14,
1-3/5-2/5
=1-(3/5+2/5)
=1-1
=0,
4/5-3/10+2/3
=8/10-3/10+2/3
=1/2+2/3
=7/6.
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