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数学
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1/1x3+1/3x5+1/5x7+1/7x9+1/9x11=?
人气:447 ℃ 时间:2020-04-22 20:14:31
解答
=1/2×(1-1/3+1/3-1/5+1/5-1/7+17-1/9+1/9-1/11)
=1/2×(1-1/11)
=1/2×10/11
=5/11
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