2002²-2001²+2000²-1999²+···+2²-1²

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2002²-2001²+2000²-1999²+···+2²-1²
2002²-2001²+2000²-1999²+···+2²-1²

2002²-2001²+2000²-1999²+···+2²-1²
2002²-2001²+2000²-1999²+···+2²-1²
=(2002-2001)(2002+2001)+(2000-1999)(2000+1999)+.+(2-1)(2+1)
=4003+3999+3993+.3