论文部分内容阅读
直线、平面、简单几何体这一章,山东今年选择了9(B)本,即增加了空间向量及其相关的内容,因此,在学习这一章时要注意灵活运用向量法来解决立体几何的问题,运用这种方法可以把立体几何问题代数化,降低了难度,减轻了负担.下面就近几年高考题中的部分立体几何题目用向量法给予解答、阐述.1 求异面直线所成的角及与角有关的题目 求异面直线所成的角,按传统的做法,应平移使两条直线在同一平面内且交于同一点,然后用三角函数(如余弦定理)来求解,对于平移到什么位置最合理是一个难点,而用向量公式cos
This section of the line, plane, and simple geometry, this year, Shandong chose the 9(B) version, which increases the spatial vector and its related content. Therefore, when studying this chapter, we must pay attention to the flexible use of vector methods to solve the problem of solid geometry. Problems, using this method can be used to algebraize the three-dimensional geometric problems, reducing the difficulty, reducing the burden. In the following years, some of the three-dimensional geometric problems in the college entrance examination questions are explained and explained by the vector method.1. The corners and the angle-related problems find the angles formed by the different straight lines. According to the traditional practice, they should be translated so that the two straight lines lie in the same plane and intersect at the same point, and then use trigonometric functions (such as the cosine theorem) to solve the problem. It is a difficult point to translate to what position, and use the vector formula cos