2-4+6-8+10-12+....-2000+2002-2004+2006=???
2+(-4+6)+(-8+10)+.........+(-2004+2006)=2*502=1004
2006/2=10031003/2=501....12-4=6-8=-2 -2*501+2006=-1002+2006=10041004
2(-4+6)...........................2004+20062+501*2=1004
2+(-4+6)+(-8+10)........+(-2004+2006)=2*502=1004就這樣
(2-4)+(6-8)........+(2002-2004)+2006=-2*501+2006=2006-1002=1004
_________________jason
2006/2+1=1004
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