2003²-(-2002)²+2001²-(-2000)²+…+3²-(-2)²+1²
问题描述:
2003²-(-2002)²+2001²-(-2000)²+…+3²-(-2)²+1²
提示:a²-b²=(a+b)(a-b)
答
=4005+4001+3997.+5+1=4006*1004made作错了………应该是4006*501