平面几何中,形如a=b+c、a/b=c~n/d~n和m·n=a·b+c·d的不对称等式的证明,需要一定的技巧,初中学生往往感到比较困难,本文的目的在于探索证明这三类问题的一般思路。一对于形如a=b+c的不对称等式,可把线段a分成m、n两段,并使m=b,再证 In plane geometry, the proof of asymmetry equations such as a=b+c, ​​a/b=c~n/d~n, and m·n=a·b+c·d require certain skills for junior high school students. Often feel more difficult, the purpose of this article is to explore the general ideas to prove these three types of issues. For asymmetric equations such as a=b+c, ​​divide line a into m and n, and make m=b.