1997+1998+1999+2000+2001+2002+2003+2004 To calculation 1997+1998+1999+2000+2001+2002+2003+2004 Brief calculation

Formula:(first item + final item)× number of items ÷2, so (1997+2004)×8÷2=16004

2004+2003-2002-2001+2000+1999-1998-6-5+4+3-2-1

2004+2003-2002-2001+2000+1999-1998…… -6-5+4+3-2-1
=(2004-2002)+(2003-2001)+(2000-1998)+(1999-1997)+…… +(4-2)+(3-1)
=2×2004/2
=2004

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