有些几何题,在已知条件不变、图中某些直线(或线段)不动的情况下,另一直线(或线段)在原图中上、下平移或绕着某点旋转其结论还是成立.实际上许多数学题都是通过这种方式变化得来的,通过对这种类型题的深入分析、讨论可以培养同学们用运动的观点分析、解决静止的数学问题的能力,达到灵活掌握数学知识的目的. Some geometric problems, in the case of known conditions remain unchanged, some lines (or line segments) in the figure do not move, the other line (or line segment) in the original translation, up and down translation or rotation around a point of its conclusion is true Actually, many mathematics problems are changed in this way. Through in-depth analysis and discussion of this type of questions, students can develop their ability to use motion analysis and solve static math problems to achieve flexible mathematics. The purpose of knowledge.