“几何几何,想破脑壳”,可见解平面几何题还是蛮难的,但是,笔者一贯反对“蛮算”,因为那样做不仅抹杀了几何的美感,更要紧的是不易看透问题的本质、意义以及与其它问题的联系,这对于后续的学习是不利的.“弱水三千,只取一瓢”,本短文利用对称思想,给出三道小题的简洁优雅的解法 “Geometry geometry, like to break the skull”, it can be seen that solving plane geometry problems is quite difficult. However, the author always opposes “beautiful”, because doing so not only erases the geometric beauty, but even more important is that the nature and meaning of the problem is not easy to see through. And the connection with other issues, this is unfavorable for the follow-up study. “Weak water is only 3,000, just take a spoon.” This essay uses symmetry to give a simple and elegant solution to three problems.