这些题目怎么做？急急急！
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
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