2/1x3+2/3X5+2/5x7=2/7x9+2/9x11计算..

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2/1x3+2/3X5+2/5x7=2/7x9+2/9x11计算..
2/1x3+2/3X5+2/5x7=2/7x9+2/9x11
计算..

2/1x3+2/3X5+2/5x7=2/7x9+2/9x11计算..
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

=（1-1/3）+（1/3-1/5）+...+(1/9-1/11)=10/11
中间的=号应该是+