2/1x3+2/3X5+2/5x7=2/7x9+2/9x11
2/1x3+2/3X5+2/5x7=2/7x9+2/9x11
计算..
计算..
数学人气：583 ℃时间：2020-05-02 12:46:54
优质解答
2/1x3+2/3X5+2/5x7+2/7x9+2/9x11=1-1/3+1/3-1/5.+1/9-1/11=1-1/11=10/11
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