简便计算法
1个回答
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1/2+1/3-1/4
=5/6-1/4
=7/12
2-5/12-7/12
=2-(5/12+7/12)
=2-1
=1
9/7+1/6+5/6+5/7
=(9/7+5/7)+(1/6+5/6)
=2+1
=3
1/5+1/2+4/5
=(1/5+4/5)+1/2
=1+1/2
=1又1/2
13/15-(13/15-2/5)
=13/15-13/15+2/5
=0+2/5
=2/5
4/5+(3/8-1/4)
=4/5+1/8
=37/40
2-3/7-4/7
=2-(3/7+4/7)
=2-1
=1
5/8-1/3+5/12
=7/24+5/12
=17/24
=5/6-1/4
=7/12
2-5/12-7/12
=2-(5/12+7/12)
=2-1
=1
9/7+1/6+5/6+5/7
=(9/7+5/7)+(1/6+5/6)
=2+1
=3
1/5+1/2+4/5
=(1/5+4/5)+1/2
=1+1/2
=1又1/2
13/15-(13/15-2/5)
=13/15-13/15+2/5
=0+2/5
=2/5
4/5+(3/8-1/4)
=4/5+1/8
=37/40
2-3/7-4/7
=2-(3/7+4/7)
=2-1
=1
5/8-1/3+5/12
=7/24+5/12
=17/24
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