1×2/1+2×3/1+.2014×2015/1的值是多少,数字太大了= =
最好要有过程,有的会多加分的
人气：180 ℃ 时间：2020-01-03 23:40:01
解答
1×2/1+2×3/1+.2014×2015/1你写反了.
=1/1-1/2+1/2-1/3+1/3-1/4+.+1/2014-1/2015
=1-1/2015
=2014/2015
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