2*4分之1+4*6分之1+6*8分之1...+2012*2014分之1等于多少
人气:306 ℃ 时间:2020-01-09 08:08:21
解答
2*4分之1+4*6分之1+6*8分之1...+2012*2014分之1
=1/2×(1/2-1/4+1/4-1/6+1/6-1/8……+1/2012-1/2014)
=1/2×(1/2-1/2014) (其它都约掉了)
=1/2×1006/2014
=503/2014谢谢我想问你一下为什么这样做??不客气,如有帮助清采纳
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