3.9+39.9+399.9+3999.9用简便算法

分类: 作业答案 • 2022-07-26 23:46:06

问题描述：

答

3333+(0.9+9.9+99.9+999.9)
=3333+1+10+100+1000-0.1*4
=4444-0.4
=4443.6

答

解: 3.9+39.9+399.9+3999.9
=(4-0.1)+(40-0.1)+(400-0.1)+(4000-0.1)
=4+40+400+4000-0.4
=4444-0.4
=4443.6
祝你开心

答

3.9+39.9+399.9+3999.9
=（4-0.1）+（40-0.1）+（400-0.1）+（4000-0.1）
=（4+40+400+4000）-（0.1+0.1+0.1+0.1）
=4444-0.4
=4443.6