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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