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义务教育代数教科书(人教版)“函数及其图象”一章,与统编教材比较,把教学的重点移到了一次函数的图象和性质,相对地削弱了二次函数图象的地位,仅对最基本的性质:顶点、对称轴和开口方向有所要求.删掉了一元二次不等式的内容.在作了这些变动以后,如何教学二次函数的图象,是大家都
The chapter “Functions and Images” of the Compulsory Education Algebra Textbook (PEP) compares it with the textbook, shifts the teaching focus to the image and nature of a function, and relatively weakens the status of the quadratic function image. Only the most basic properties: vertex, axis of symmetry, and direction of opening are required. The content of the quadratic inequalities is removed. After making these changes, how to teach the image of the quadratic function is that everyone