一、“位似”教学中的困惑困惑1位似的定义与课本练习自相矛盾人教版九年级对“位似”的定义:图中的两个多边形不仅相似,而且对应顶点的连线交于一点,对应边互相平行,像这样的两个图形叫做位似图形,这个点叫做位似中心. First, the “bit like ” confusion in teaching confusion 1 bit like the definition of self-contradictory textbook practice version of the ninth grade “bit like ” definition: the two polygons not only similar to the map, but also Vertices connected to a little line, the corresponding side parallel to each other, like this two graphics called bit-like graphics, this bit is called bit-like center.