1\2x4+1\4x6+1\6x8+…+1\2012x2014等于?,
问题描述：
1\2x4+1\4x6+1\6x8+…+1\2012x2014等于?,
答
原式
=1/2x(2/2x4+2/4x6+2/6x8+···+2/2012x2014)
=1/2x(1/2-1/4+1/4-1/6+1/6-1/8+···+1/2012-1/2014)
=1/2x(1/2-1/2014)
=1/2x1006/2014
=1003/2014嗯，不错不错，点赞
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