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九年级期中考试,最后一小题,全班无同学能解答。究其原因,是学生没有找到图形中的特殊角45°角。教学目标:利用直角坐标系中点的特殊位置寻找45°角;结合二次函数的图像证明三角形相似;综合运用45°角、一次函数、二次函数的图像、相似三角形等知识解决问题。重点:45°角在二次函数中的应用。难点:综合运用45°角、一次函数、二次函数的图像、相似三角形等知识解决数学问题。过程:试卷24题。
Grade nine midterm exam, the last little problem, no classmates can answer. The reason is that students did not find a special angle of 45 ° in the graph. Teaching Objectives: Use the special position of the point in Cartesian coordinates to look for 45 ° angle; combine the image of quadratic function to prove that the triangles are similar; use the knowledge of 45 ° angle, first order function, second order function and similar triangles to solve the problem. Focus: 45 ° angle in the quadratic function. Difficulties: The comprehensive use of 45 ° angle, a function, quadratic function images, similar triangles and other knowledge to solve mathematical problems. Process: Paper 24 questions.