简便计算题,2.4乘1.8减4.8乘0.43.7乘8.7加6.2乘8.7加0.874.2乘6.5除以1.34.6除以(0

问题描述:

简便计算题,
2.4乘1.8减4.8乘0.4
3.7乘8.7加6.2乘8.7加0.87
4.2乘6.5除以1.3
4.6除以(0.4乘2.3)
3.6除以4.8乘0.8
(6.4加3.2)除以8
3.2乘0.1加6.32乘9
11.26减8.73加2.73
是简便算法,说是用计算计算的滚开
不要光有结果
1个回答 分类:数学 2014-10-09

问题解答:

我来补答
2.4*1.8-4.8*0.4
=2.4*2*1.8/2-4.8*0.4
=4.8*0.6-4.8*0.4
=4.8*(0.6-0.4)
=4.8*0.2
=2.4
3.7*8.7+6.2*8.7+0.87
=3.7*8.7+6.2*8.7+8.7*0.1
=(3.7+6.2+0.1)*8.7
=10*8.7
=87
4.2*6.5/1.3
=4.2*(6.5/1.3)
=4.2*5
=21
4.6/(0.4*2.3)
=4.6/2.3*0.4
=2*0.4
=0.8
3.6/4.8*0.8
=3.6*0.8/4.8
=28.8/4.8
=6
(6.4+3.2)/8
=6.4/8+3.2/8
=0.8+0.4
=1.2
3.2*0.1+6.32*9
=3.2*0.1+6*9+0.32*9
=3.2*(0.1+0.9)+6*9
=57.32
11.26-8.73+2.73
=11.26+2.73-8.73
=14-8.73
=5.27
 
 
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