要综合算式
（2+4+6+……+1998+2000）-（1+3+5.+1997+1999)
人气：195 ℃ 时间：2020-06-08 16:46:33
解答
因为去括号=2+4+6+.+1998+2000-1-3-5-.-1997-1999
=（2-1）+（4-3）+（6-5）+.+（1998-1997）+（2000-1999）
=1+1+1+.+1+1
=2000÷2
=1000
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