2002×200320032003-2003×200220022002=?

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2002×200320032003-2003×200220022002=?
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2002×200320032003-2003×200220022002=?
2002×200320032003-2003×200220022002=?

2002×200320032003-2003×200220022002=?
2002×200320032003-2003×200220022002
=2002×2003×100010001-2003×2002×100010001
=0

2002×200320032003-2003×200220022002
=2002×2003×100010001-2002×2003×100010001
=0

2002×200320032003-2003×200220022002
=2002×200320032003-(2002+1)×200220022002
=2002×(200320032003-200220022002)-200220022002
=2002×100010001-200220022002
=200220022002-200220022002
=0