如图1-1，每一线段的端点上两数之

如图1-1，每一线段的端点上两数之和算作线段的长度，那么图中6条线段的长度之和是,\6J(_2I 。5H/l7@3?.T*X2y,O2x'l/k

　                                                                                                                          　5H/l7@3?.T*X2y,O2x'l/k