4.计算下面各题
2个回答
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5/12+3/4-1/12
=(5/12-1/12)+3/4
=1/4+3/4
=1
7/10-3/8-1/8
=7/10-(3/8+1/8)
=7/10-1/2
=1/5
4/9+1/10+5/9
=(4/9+5/9)+1/10
=1+1/10
=1又1/10
7/8+3/4-3/2
=13/8-3/2
=1/8
5/2-3/14-2/7
=5/2-(3/14+2/7)
=4/2-1/2
=2
3/5+17/20-1/10
=3/5+(17/20-1/10)
=3/5+3/4
=27/20
=(5/12-1/12)+3/4
=1/4+3/4
=1
7/10-3/8-1/8
=7/10-(3/8+1/8)
=7/10-1/2
=1/5
4/9+1/10+5/9
=(4/9+5/9)+1/10
=1+1/10
=1又1/10
7/8+3/4-3/2
=13/8-3/2
=1/8
5/2-3/14-2/7
=5/2-(3/14+2/7)
=4/2-1/2
=2
3/5+17/20-1/10
=3/5+(17/20-1/10)
=3/5+3/4
=27/20
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