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函数是高中数学的灵魂,二次函数是“3个二次”的灵魂,运用二次函数的图像和性质把另两个二次串联起来,形成了“3个二次”的知识系统和网络结构,同时“3个二次”是沟通低
The function is the soul of high school mathematics. The quadratic function is the soul of “three second times.” The image and property of the quadratic function are used to connect the other two times in series to form “three secondary” Knowledge system and network structure, meanwhile “3 times ” is low communication