计算下面各题(能简便的用简便方法) 1/5+7/15+4/15 7/10-(3/4-2/5) 1-7/15-2/5 13
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/09/04 19:42:43
计算下面各题(能简便的用简便方法) 1/5+7/15+4/15 7/10-(3/4-2/5) 1-7/15-2/5 13/15-(1/3+2/5)
1-3/10-2/5 5-3/7+4/7 23/24-1/6-3/8 4/9+1/10+5/9 1/12+3/8+11/12+5/8 1-(3/11-5/9)
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1-3/10-2/5 5-3/7+4/7 23/24-1/6-3/8 4/9+1/10+5/9 1/12+3/8+11/12+5/8 1-(3/11-5/9)
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1/5+7/15+4/15
=3/15+7/15+4/15
=14/15
7/10-(3/4-2/5)
=7/10-3/4+2/5
=14/20-15/20+8/20
=7/20
1-7/15-2/5
=1-(7/15+6/15 )
=1-13/15
=2/15
13/15-(1/3+2/5)
=13/15-5/15-6/15
=2/15
5-3/7+4/7
=5-1/7
=4又6/7
23/24-1/6-3/8
=23/24-4/24-9/24
=5/12
4/9+1/10+5/9
=4/9+5/9+1/10
=1+1/10
=1.1
1/12+3/8+11/12+5/8
=(1/12+11/12)+(3/8+5/8)
=1+1
=2
1-(3/11-5/9)
=1-27/99+55/99
=1+28/99
=1又28/99
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=3/15+7/15+4/15
=14/15
7/10-(3/4-2/5)
=7/10-3/4+2/5
=14/20-15/20+8/20
=7/20
1-7/15-2/5
=1-(7/15+6/15 )
=1-13/15
=2/15
13/15-(1/3+2/5)
=13/15-5/15-6/15
=2/15
5-3/7+4/7
=5-1/7
=4又6/7
23/24-1/6-3/8
=23/24-4/24-9/24
=5/12
4/9+1/10+5/9
=4/9+5/9+1/10
=1+1/10
=1.1
1/12+3/8+11/12+5/8
=(1/12+11/12)+(3/8+5/8)
=1+1
=2
1-(3/11-5/9)
=1-27/99+55/99
=1+28/99
=1又28/99
请在4天内发给我!
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