A老师要上一节区级公开课,课题是“图形旋转巧转化”.为了让同备课组的老师能给她点建议,她进行了试讲.前2次试讲被否决的地方比较多,经过改动,今天又进行了第3次试讲.这节课开始是情境引入,在这个环节,学生能强烈地感受到:巧旋转能使问题的解决变得非常容易.接着就是两个活动,活动一是通过几个小题,让学生体验一下什么条件下可以旋转,怎样旋转才能“巧”; A teacher to a district-level open class, the subject is “To turn the graphics rotation clever. ” In order to make the same lesson preparation group teacher to give her advice, she conducted a trial. More, after changes, today conducted a third trial.This lesson begins with the introduction of the situation, in this session, students can feel strongly: Qiao rotation can make the problem easier to solve.Then is the two One activity, one activity through a few small problems, so that students can experience what conditions can be rotated, how to rotate “Qiao ”;