用简便的方法计算下面各题.①3.84*9.6+0.96*61.6 ②2.9*0.45+0.29*4.2+0.029*13
问题描述:
用简便的方法计算下面各题.①3.84*9.6+0.96*61.6 ②2.9*0.45+0.29*4.2+0.029*13
答
第一个:
=3.84*9.6+9.6*6.16
=9.6*(3.84+6.16)
=9.6*10
=96
第二个:
=2.9*0.45+2.9*0.42+2.9*0.13
=2.9*(0.45+0.42+0.13)
=2.9*1
=2.9