用简便方法计算下面各题.(用递等式,5分钟之内解决可以得10悬赏)2.9*0.45+0.29*4.2+0.029*13 3.84*9.6+0.96*61.6

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用简便方法计算下面各题.(用递等式,5分钟之内解决可以得10悬赏)2.9*0.45+0.29*4.2+0.029*13 3.84*9.6+0.96*61.6
用简便方法计算下面各题.(用递等式,5分钟之内解决可以得10悬赏)
2.9*0.45+0.29*4.2+0.029*13 3.84*9.6+0.96*61.6

用简便方法计算下面各题.(用递等式,5分钟之内解决可以得10悬赏)2.9*0.45+0.29*4.2+0.029*13 3.84*9.6+0.96*61.6
2.9*0.45+0.29*4.2+0.029*13
=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
3.84*9.6+0.96*61.6
=3.84*9.6+9.6*6.16
=9.6*(3.84+6.16)
=9.6*10
=96