思维定势是指学生已有的知识结构和思维方式等对思维过程发生比较强烈的作用,从而使思维活动呈现出一定的方向性.思维定势对帮助学生熟练解决同类问题,是有积极作用的,但也可能导致学生忽视某些条件的变化,仍然按原来的方式思考,从而产生错误.例1 有一长25cm、底面积为300cm~2的长方体木块,密度为0.8×10~3kg/m~3,横截面积是 Mindset refers to the fact that the students’ existing knowledge structure and thinking modes have a stronger effect on the thinking process, thus making the thinking activities show a certain direction. Thinking and setting are positive for helping students master the same problems. However, it may also cause students to ignore certain changes in the conditions and still think in the original way, resulting in errors. Example 1 A rectangular block with a length of 25cm and a base area of ​​300cm~2 with a density of 0.8×10~3kg/ m~3, the cross-sectional area is