论文部分内容阅读
一点二面三垂线 ,解决问题是关键 ;垂足平面与垂线 ,图中位置细分辨 .已知条件想性质 ,再推性质要精选 ;求证结论想判定 ,解题思路方可现 .言必有据书写简 ,说理计算序不变 ;概念定理熟记准 ,解题正确结果见 .说明 1 点、平面、垂线是解立体几何题的关键 .点主要是指垂足 ,
The two sides and three vertical lines, the solution to the problem is the key; the vertical plane and the vertical line, the location of the figure is finely resolved. Known conditions want the nature, and then push the nature to be selected; verification conclusions want to determine, problem solving ideas can be found The words must be written in a concise manner, and the rationale of the computational order remains unchanged; the concept theorem is well documented and the correct result of the problem is seen. The explanation is that the point 1, plane, and perpendicular line are the key to solving the three-dimensional geometrical problem. The point mainly refers to the foot-foot,