Question

请帮忙用简便方法计算下面各题

请帮忙用简便方法计算下面各题,谢谢

1题：2.9 x 0.45 + 0.29 x4.2 + 0.029 x13 =？

2题：3.84 x 9.6 + 0.096 x 61.6 =?

Answer 1

1.原式=0.29*(4.5+4.2+1.3)
=0.29*10
=2.9
2.是不是0.96？
原式=0.96*(38.4+61.6)
=0.96*100
=96

Answer 2

2.9 x 0.45 + 0.29 x4.2 + 0.029 x13
=2.9*0.45+2.9*0.42+2.9*013
=（0.45+0.42+0.13）*0.29
=1*0.29
=0.29
3.84 x 9.6 + 0.096 x 61.6
=9.6*3.84+9.6*0.616
=4.456*9.6=42.7776

Answer 3

1. 2.9 x 0.45 + 0.29 x4.2 + 0.029 x13 =？
原式 0.029x45+0.029x42+0.029x13
=0.029x(45+42+13)
=0.029x100
=2.9
2. 3.84 x 9.6 + 0.096 x 61.6 =?
=384x0.096+0.096x61.6
=0.096x(384+61.6)
=0.096x445.6
= 第二提示不是给错了 二楼说得对

Answer 4

第一题：
=2.9x0.45+2.9x0.42+2.9x0.13=2.9x1=2.9
这题就是把后面0.29和0.029化成2.9而把其相乘的数除以相应的十位、百位或者千位。

第二题也一样
=3.84x9.6+9.6x0.616=9.6x4.456=42.7776
我怀疑你第二题小数点有问题，你再仔细看看题目是不是616而不是61.6。

Answer 5

1. =0.29*4.5+0.29*4.2+0.29*1.3
=0.29*（4.5+4.2+1.3）
=0.29*10
=2.9
2. =3.84*9.6+9.6*0.616
=9.6*4.456
=42.7776

Answer 6

1.原式=0.29 x4.5+0.29 x4.2+0.29 x1.3
=0.29 x（4.5+4.2+1.3）
=0.29 x10
=2.9