=1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13
=1/3-1/13
=10/39
1/3×2/5+1/5×2/7+1/7×2/9+1/9×2/11+1/11×2/13 算式
1/3×2/5+1/5×2/7+1/7×2/9+1/9×2/11+1/11×2/13 算式
数学人气：578 ℃时间：2019-12-09 22:38:24
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