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近年来,各地中考数学的一个热门考点就是定值问题.定值问题以运动变化为载体,设计蕴涵于运动之中的数量关系、位置关系、几何性质不变问题.由于“定值”问题,侧重于考查学生透过运动表象把握问题内在的本质以及分析解决问题的能力,有一定的综合性、探索性和难度.解决这类问题时,要善于运用辩证的观点从特殊到一般去思考分析,在“变化”的元素中寻求“不变”的量.特别当定值是未知时,一般可采用特殊位置或极端位置,探得定值.然后可借助特殊位置的思路作
In recent years, one of the most popular test centers for maths examinations in various places is the problem of fixed value.The problem of fixed value takes the change of sports as the carrier, and the design contains the quantitative relationship, the positional relation and the constant geometric nature in the movement.As “fixed value” Problem, focusing on examining students’ inherent nature and ability to analyze and solve problems through the appearance of movement, has certain comprehensiveness, exploration and difficulty. To solve such problems, we should be good at using dialectical perspectives from special to general Think analytically and look for “unchangeable” quantities in the “change ” elements, especially when the set value is unknown, you can generally use special or extreme positions to explore settings. Ideas for making