函数是中学数学的核心内容,函数关系的建立是函数的“灵魂”,具有实际背景的函数关系的建立是一个难点,如何破解这个难点是一个无法回避的问题.在今年的高三复习中,笔者试从必修1教材一道习题出发,通过该题的横向变式和纵向类比来突破,是否妥当,求教于各位专家和同行.1具体的教 Function is the core content of middle school mathematics. The establishment of function relationship is the “soul” of function. The establishment of functional relationship with actual background is a difficult point. How to solve this difficulty is an unavoidable problem. During this year’s third year review, the author Try starting from the subject of a compulsory 1 teaching material, and through the problem of horizontal and vertical analogy to break through, whether it is appropriate, ask the experts and colleagues to consult. 1 specific teaching