1x2/1+2/1x3/1+3/1x4/1+4/1x5/1+5/1x6/1+6/1x7/1+7/1
1x2/1+2/1x3/1+3/1x4/1+4/1x5/1+5/1x6/1+6/1x7/1+7/1x8/1+8/1x9/1+9/1x10/1简...
1x2/1+2/1x3/1+3/1x4/1+4/1x5/1+5/1x6/1+6/1x7/1+7/1x8/1+8/1x9/1+9/1x10/1简
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