(2+4+6+8……+1996)-(1+3+5+……+1995)
=(2-1)+(4-3)+(6-5)+...(1994-1993)+(1996-1995)
=1+1+..+1+1
=1996/2=998
数学简便运算:(2+4+6+8……+1996)-(1+3+5+……+1995)
数学简便运算:(2+4+6+8……+1996)-(1+3+5+……+1995)
数学人气:501 ℃时间:2020-02-05 14:58:01
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