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近期,笔者有幸参加了陕师大附中毕业年级课堂教学研讨活动之初中数学研讨活动,聆听了展示课《二次函数图像平移的再探究》,感触颇深,现对该课例做以点评,供各位同行参考指正。一、教学过程1.巧妙导入,由浅及深教师:将原点(0,0)向左平移1个单位长度,再向下平移4个单位长度,得到哪个点呢?学生:(-1,-4)。教师:点的平移变化规律是“右加左减,上加下减”。教师:将抛物线y=x2向左平移1个单位长度,再向下平移4个
Recently, the author had the privilege of participating in the junior middle school mathematics research activities in the secondary school graduation class teaching and research activities at Shanxi Normal University, and listening to the demonstration class “Re-exploration of quadratic function image translation”. He was deeply impressed and commented on the class. For your peers refer to correct me. First, the teaching process 1. Cleverly introduced, by shallow and deep teacher: the origin (0,0) translates to the left by 1 unit length, then translates by 4 unit length, which point? Student: (-1, - 4). Teacher: The translational change of the point is “right plus left minus, plus plus minus”. Instructor: Translate parabola y=x2 to the left by 1 unit length, then pan 4 down