1乘以1/2+1/2乘以1/3+1/3乘以1/2013乘以1/2014

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1乘以1/2+1/2乘以1/3+1/3乘以1/2013乘以1/2014
1乘以1/2+1/2乘以1/3+1/3乘以1/2013乘以1/2014

1乘以1/2+1/2乘以1/3+1/3乘以1/2013乘以1/2014
1乘以1/2+1/2乘以1/3+1/3乘以1/2013乘以1/2014
=1-1/2+1/2-1/3+1/3x1/4+...+1/2013-1/2014
=1-1/2014
=2013/2014
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1乘以1/2+1/2乘以1/3+1/3乘以。。。。。1/2013乘以1/2014
=1-1/2+1/2-1/3+1/3+.......+1/2013-1/2014
=1-1/2014
=2013/2014

一般这样的题目都是1吧