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)
=10+100+1000+10000-0.4
=11110-0.4
=11109.6
有不明白的可以追问!谢谢!!
祝学习进步!
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)
=10+100+1000+10000-0.4
=11110-0.4
=11109.6
应该是对的 这种问题要找规律
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)
=10+100+1000+10000-0.4
=11110-0.4
=11109.6
(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
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)
=10+100+1000+10000-0.4
=11110-0.4
=11109.6
如有不懂可追问。 好的话请采纳。