Question

这道题怎样简便就怎样算

Answer 1

320000-800-799-……好段-401+400+399+……禅罩+1
=320000-（友袭誉800+401）×400÷2+（400+1）×400÷2
=320000-1201×200+401×200
=320000-（1201-401）×200
=320000-800×200
=320000-160000
=160000

Answer 2

320000-800-799-798…-401+400+399+398+…清宏判答改绝悄…+2+1
=32000-(800-400)-(799-399)-(798-398)-…-(402-2)-(401-1)
=320000-400×400
=320000-160000
=160000

追问

答得太棒了，谢谢