(2000+1998+1996+.+2)-(1+3+5+.1999)
=(2000-1999)+(1998-1997)+.+(2-1) (此式共1000项)
=1000
2000-1+1998-3+1996-5+...+4-1997+2-1999=?
2000-1+1998-3+1996-5+...+4-1997+2-1999=?
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数学人气:420 ℃时间:2019-12-24 05:13:24
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