Question

0.57乘以4.2+5.7乘以0.58简便方法？

Answer 1

这道题可以简便运算，运用四则运算法则，先将5.7*0.58=0.57*10*0.58=0.57*5.8，再提取公共项0.57,乘以4.2+5.8的和即可。即：0.57*4.2+5.7*0.58=0.57*4.2+0.57*10*0.58=0.57*4.2+0.57*5.8=0.57*(4.2+5.8)=0.57*10=5.7 谢谢

Answer 2

0.57×4.2+5.7×0.58
把5.7转化为0.57：
=0.57×4.2+(5.7÷10)×(0.58×10)
=0.57×4.2+0.57×5.8
提取公因数0.57：
=0.57×(4.2+5.8)
=0.57×10
=5.7

Answer 3

先对原式进行一下变形，再利用乘法分配律使计算简便
0.57*4.2+5.7*0.58
=5.7*0.42+5.7*0.58
=（0.42+0.58）*5.7
=1*5.7
=5.7

Answer 4

0.57×4.2+5.7×0.58
＝0.57×4.2+0.57×5.8
＝0.57×（4.2+5.8）
＝0.57×10
＝5.7

Answer 5

0.57x4.2+5.7x0.58
=5.7x0.42+5.7x0.58
=5.7x（0.42+0.58）
=5.7x1
=5.7