这些题目怎么做？急急急！

更新时间2018-09-22 11:01:44

简便计算

0.25乘32乘12.5      103乘0.24      2.73乘99      3.84乘9.6加0.96乘61.6      2.9乘0.45加0.29乘4.2加0.029乘13

0.32乘12.5乘2.5      0.02乘38.7乘50      6.5乘2.4加6.5乘7.6      4.9乘1.02

0.25×32×12.5      

=（0.25×4）×（8×12.5）

=1×100

=100

103×0.24      

=（100+3）×0.24

=24+0.72

=24.72

2.73×99      

=2.73×（100-1）

=273-2.73

=270.27

3.84×9.6＋0.96×61.6      

=3.84×9.6+9.6×6.16

=（3.84+6.16）×9.6

=10×9.6

=96

2.9×0.45+0.29×4.2+0.029×13

=2.9×（0.45+0.42+0.13）

=2.9×1

=2.9

 

0.32×12.5×2.5      

=0.4×2.5×0.8×12.5

=1×10

=10

0.02×38.7×50

=0.02×50×38.7      

=1×38.7

=38.7

6.5×2.4+6.5×7.6

=6.5×（2.4+7.6）

=6.5×10

=65

 

4.9×1.02

=4.9×（1+0.02）

=4.9+0.098

=4.998