(1-1/2002)+(2-1/2002×2)+(3-1/2002×3)+
问题描述:
(1-1/2002)+(2-1/2002×2)+(3-1/2002×3)+
(1-1/2002)+(2-1/2002×2)+(3-1/2002×3)+…+(2001-1/2002×2001)+(2002-1/2002×2002)多谢
答
提取公因素,手机很难码字,结果是2003*1001*2001/2002