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近几年,在全国各地陆续实施新课程,部分省、市中考试卷中,频频出现创新题．这类试题题型新颖,解 题过程中要求有一定的创造性和探索性．其中一类有关图形的旋转问题,对考查学生的空间想象能力、变式创新能 力、运用新知识、解决新问题的能力有独特的作用。 所谓旋转,就是在同一平面内将某个图形,绕一个定点沿某个方向转动一个角度的图形运动．由于旋转 不改变图形的形状与大小,只是位置发生变化,使图中的相关条件发生了新的联系,在解答较综合性的数学 题目时,有时要采用此方法,把一些分散的条件转化为直接联系的相关内容,从而使问题得到解决,本文 就精选了若干典型试题,分类说明巧用旋转的解法评析,供参考。
In recent years, innovative curriculums have frequently appeared in the examination papers of some provinces and cities throughout the country. Questions of this type of questions new, problem-solving process requires a certain degree of creativity and exploration. One of these types of graphics rotation problems has a unique role in examining students’ ability to use their spatial imagination, variant innovation, apply new knowledge and solve new problems. The so-called rotation, is in the same plane will be a graphic, around a fixed point in a direction of rotation of a perspective movement of the figure. As the rotation does not change the shape and size of the graphics, but the position changes, so that the relevant conditions in the graph a new link in the solution to more comprehensive mathematical problems, and sometimes to adopt this method, the number of scattered conditions into Direct contact with the relevant content, so that the problem can be solved, this article on the selection of a number of typical questions, classification instructions clever use of rotation solution evaluation, for reference.