对结论以“1a+1b=1c”形式出现的几何证明题,许多初学几何的同学感到困难,其实,只要掌握了它的证明技巧,问题就容易了.证明这类几何题,首先应将问题的结论变为ca+cb=1,然后按照下列步骤进行证明:⑴将ca和cb分别转化为ca=mm+n和cb=nm+n,其中,线段m、n应考虑在同一条直线上;⑵通? To the conclusion of the geometric proving problem in the form of “1a+1b=1c”, many beginner geometry students feel difficult. In fact, as long as they have mastered its proving skills, the problem is easy. Prove the problem of this kind of geometry, the first question should be The conclusion is changed to ca+cb=1, and then the following steps are used to prove: (1) convert ca and cb to ca=mm+n and cb=nm+n, respectively, where the line segments m and n should be considered on the same line (2) General?