(1994+1992+······+4+2)—(1+3+5+······+1991+1993)=( )
问题描述:
(1994+1992+······+4+2)—(1+3+5+······+1991+1993)=( )
答
(1994+1992+······+4+2)—(1+3+5+······+1991+1993)
=(1994-1993)+(1992-1991)+……+(2-1) 共1994÷2=997组
=1X997
=997