数学简便简便计算
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/07/19 16:41:29
数学简便简便计算
![](http://img.wesiedu.com/upload/3/3f/33f903bf59fd6318255956b9fc3fa646.jpg)
![](http://img.wesiedu.com/upload/d/dc/ddc7b1b556c6bde8f3693954e311260c.jpg)
![](http://img.wesiedu.com/upload/d/5f/d5f1c29df38d9a6adde1a48b6e99daa0.jpg)
![](http://img.wesiedu.com/upload/e/c8/ec8aee0246f01601facc5cfa8b0786f6.jpg)
![](http://img.wesiedu.com/upload/3/3f/33f903bf59fd6318255956b9fc3fa646.jpg)
![](http://img.wesiedu.com/upload/d/dc/ddc7b1b556c6bde8f3693954e311260c.jpg)
![](http://img.wesiedu.com/upload/d/5f/d5f1c29df38d9a6adde1a48b6e99daa0.jpg)
![](http://img.wesiedu.com/upload/e/c8/ec8aee0246f01601facc5cfa8b0786f6.jpg)
4.8X0.25=(4+0.8)X0.25=4X0.25+0.8X0.25=1+0.2=1.2
0.78X98=0.78X(100-2)=0.78X100-0.78X2=78-1.56=76.44
0.5X2.33X8=(0.5X8)X0.33=4X0.33=1.32
1.5X105=1.5X(100+5)=150+7.5=157.5
0.3X2..5X0.4=0.3X(2.5X0.4)=0.3X1=0.3
1.2X2.5+0.8X2.5=2.5X(1.2+0.8)=2.5X2=5
打字很累,采纳谢谢
0.78X98=0.78X(100-2)=0.78X100-0.78X2=78-1.56=76.44
0.5X2.33X8=(0.5X8)X0.33=4X0.33=1.32
1.5X105=1.5X(100+5)=150+7.5=157.5
0.3X2..5X0.4=0.3X(2.5X0.4)=0.3X1=0.3
1.2X2.5+0.8X2.5=2.5X(1.2+0.8)=2.5X2=5
打字很累,采纳谢谢