0.9+9.9+99.9+999.9+9999.9怎样用简便方法计算

2024-11-16 05:38:57
推荐回答(5个)
回答1:

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)
=(1+10+100+1000+10000)-0.5
=11111-0.5
=11110.5

回答2:

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)
=(1+10+100+1000+10000)-0.5
=11111-0.5
=11110.5
赞的谢谢了

回答3:

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)
=(1+10+100+1000+10000)-(0.1X5)
=11111-0.5
=11110.5

回答4:

1-0.1+10-0.1+100-0.1+1000-0.1+10000-0.1=11111-0.5=11110.5

回答5:

1-0.1+10-0.1+100-0.1+1000-0.1+10000-0.1=11110.5