1/1x2+1/2x3+1/3x4+1/4x5+……1/8x9+1/9x10
=1-1/2+1/2-1/3+1/3-1/4+.+1/8-1/9+1/9-1/10
=1-1/10
=9/10
1/1x2+1/2x3+1/3x4+1/4x5+……1/8x9+1/9x10=?(简便算法)
1/1x2+1/2x3+1/3x4+1/4x5+……1/8x9+1/9x10=?(简便算法)
快~~~~~
快~~~~~
数学人气:350 ℃时间:2020-01-24 13:47:24
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