1.计算1+2-3+4-5+6-7+8-9+10-11+……+1992-1993+1994求答案

问题描述:

1.计算1+2-3+4-5+6-7+8-9+10-11+……+1992-1993+1994求答案

-1992

原式=1+(2-3)+(4-5)+·······+(1992-1993)+1994
=1+(1993-2+1)/2×(-1)+1994
=1-996+1994
=999

-996

999

原式=1+(2-3)+(4-5)+·······+(1992-1993)+1994
=1+996×(-1)+1994
=1-996+1994
=999

-995