简便计算:1.(1/4-1/5)*60
来源:学生作业帮 编辑:作业帮 分类:综合作业 时间:2024/05/25 03:40:20
简便计算:1.(1/4-1/5)*60
1.(1/4-1/5)*60
2.2009/2010*2009
3.(1/2+1/7)*2*7
4.(2-1/65)*13
5 .(1/8*1/3)*3*8
6.57* 3/56
7.(4/5+9/10)*20
1.(1/4-1/5)*60
2.2009/2010*2009
3.(1/2+1/7)*2*7
4.(2-1/65)*13
5 .(1/8*1/3)*3*8
6.57* 3/56
7.(4/5+9/10)*20
1.(1/4-1/5)*60
=1/4*60+1/5*60
=15+12=27
2.2009/2010*2009
=2009/2010*(2010-1)
=2009-2009/2010
=2008又1/2010
3.(1/2+1/7)*2*7
=1/2*2*7+1/7*2*7
=7+2
=9
4.(2-1/65)*13
=2*13+1/65*13
=26-1/5
=25又4/5
5 .(1/8*1/3)*3*8
=1/8*8*1/3*3
=1
6.57* 3/56
=(56+1)*3/56
=3+3/56
=3又3/56
7.(4/5+9/10)*20
=4/5*20+9/10*20
=16+18
=34
=1/4*60+1/5*60
=15+12=27
2.2009/2010*2009
=2009/2010*(2010-1)
=2009-2009/2010
=2008又1/2010
3.(1/2+1/7)*2*7
=1/2*2*7+1/7*2*7
=7+2
=9
4.(2-1/65)*13
=2*13+1/65*13
=26-1/5
=25又4/5
5 .(1/8*1/3)*3*8
=1/8*8*1/3*3
=1
6.57* 3/56
=(56+1)*3/56
=3+3/56
=3又3/56
7.(4/5+9/10)*20
=4/5*20+9/10*20
=16+18
=34
简便计算:1-2+3-4+5-6+...+59-60
简便计算:1-2+3-4+5-6...+59-60
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