简便计算过程方法如下
解:0.9+9.9+99.9+999.9+9999.9
=1-0.1+10-0.1+100-0.1+1000-0.1+10000-0.1
=11111-0.1x5
=11111-0.5
=11110.5
简便计算
0.9➕9.9➕99.9➕999.9➕9999.9
=1-0.1+10-0.1+100-0.1+1000-0.1+10000-0.1
=11111-0.1x5
=11111-0.5
=11110.5
1-0.1+10-0.1+100-0.1+1000-0.1+10000-0.1=1+10+100+1000+10000-0.1-0.1-0.1-0.1-0.1=11111-0.5=11110.5