九年级数学上册第23章图形的相似23.1成比例线段2平分线分线段成比例授课课件(新版)华东师大版.ppt

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华师版九年级数学上册,如图,一组等距离的平行线截直线a所得的线段相等,那么在直线b上所截的线段有什么关系呢?,这里我们所讨论的是平行线截直线相等的情况,那么如果截的线段不相等又会怎样呢?,(1)归纳:平行线分线段成比例定理:三条平行线截两条直线,所得的对应线段的比相等;,(2)推论:平行于三角形一边的直线截其他两边(或两边的延长线),所得的对应线段的比相等;,(3)其他成比例的线段还有哪些?,

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