我要提问:  

问题
简便运算:899999+89999+8999+899+89

请帮帮忙 谢谢了要过程和答案
答案
899999+89999+8999+899+89
=(900000-1)+(90000-1)+(9000-1)+(900-1)+(90-1)
=999990-5
=999985

粤ICP备05029465号 Power by: YESTIME.NET
Please change your screen resolutidn to1024×768 Total ,
Copyright © 2008-2009 中小学教育资源网(yestime.net). all Rights Reserved.