2003²-(-2002)²+2001²-(-2000)²+…+3²-(-2)²+1²提示:a²-b²=(a+b)(a-b)

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2003²-(-2002)²+2001²-(-2000)²+…+3²-(-2)²+1²提示:a²-b²=(a+b)(a-b)

2003²-(-2002)²+2001²-(-2000)²+…+3²-(-2)²+1²提示:a²-b²=(a+b)(a-b)
2003²-(-2002)²+2001²-(-2000)²+…+3²-(-2)²+1²
提示:a²-b²=(a+b)(a-b)

2003²-(-2002)²+2001²-(-2000)²+…+3²-(-2)²+1²提示:a²-b²=(a+b)(a-b)
=4005+4001+3997.+5+1=4006*1004