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数学
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1994-1993+1992+1991-1990.+5-4+3+2-1=
人气:471 ℃ 时间:2019-10-09 07:21:44
解答
=(1994-1993)+(1992-1991)+.+(4-3)+(2-1)
=1+1+.+1+1
=1×(1994÷2)
=997
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