“ａｂ＋ｃｄ＝ｍｎ”型几何题的证明方法张引妙“ａｂ＋ｃｄ＝ｍｎ”型综合证明题的证明方法可抽象为：其中，ｎ，±ｎ＝ｎ，且ｎ、ｎ，、ｎ，共线。即在线段ｎ上选适当的点分ｎ为ｎ１、ｎ２两段。通过证明ａｂ＝ｍｎ，和ｃｄ＝ｍｎ２这样两个熟悉的基本题，进而相加或相... The proof method for the “ab+cd=mn” type geometric problem Zhang Yinmiao The proof method for the “ab+cd=mn” type comprehensive proof can be abstracted as: where n, ±n=n, and n, n, and n are collinear. That is, the appropriate point n for the online segment n is n1 and n2. By proving that ab=mn, and cd=mn2 are two familiar basic questions, then add or phase...