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九年级数学上册第23章图形的相似23.3相似三角形1相似三角形授课课件（新版）华东师大版.ppt

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华师版九年级数学上册,由此，可以得出下面常用的结论：,平行于三角形一边的直线，和其他两边（或两边的延长线）相交所构成的三角形与原三角形相似.,

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