(1994+1992+1990...4+2)-(1+3+5+...+1993)
问题描述:
(1994+1992+1990...4+2)-(1+3+5+...+1993)
答
(1994+1992+1990...4+2)-(1+3+5+...+1993)
=1+1+...+1
=997