1994+1993-1992-1991+1990+1989-1988-1987+…+10+9-8-7+6+5-4-3+2+1
=1994+(1993-1992-1991+1990)+(1989-1988-1987+1987)+…+(10+9-8-7+6)+(5-4-3+2)+1
=1994+0+0+…+0+1
=1995
故答案为:1995.
1994+1993-1992-1991+1990+1989-1988-1987+…+10+9-8-7+6+5-4-3+2+1=_.
1994+1993-1992-1991+1990+1989-1988-1987+…+10+9-8-7+6+5-4-3+2+1=______.
数学人气:377 ℃时间:2019-10-19 17:23:28
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