Question

0.39×19.9的简便运算怎么算的

Answer 1

0.39×19.9可以这样简便运算:
0.39×（20-0.1）
＝0.39×20-0.39×0.1
＝7.8-0.039
＝7.761

Answer 2

0.39×19.9的简便运算怎么算的
简便计算如下: 0.39×19.9 =0.39×(20-0.1) =0.39×20-0.39×0.1 =7.8-0.039 =7.761

Answer 3

简便计算如下：
0.39×19.9
=0.39×（20-0.1）
=0.39×20-0.39×0.1
=7.8-0.039
=7.761

Answer 4

简便计算如下:
0.39×19.9
=0.39×(20-0.1)
=0.39×20-0.39×0.1
=7.8-0.039
=7.761

Answer 5

0.39×19.9
＝0.39×（20-0.01）
＝0.39×20-0.39×0.01
＝7.8-0.0039
＝7.7961