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抽象函数以性质抽象,图像隐蔽为主要特征,解决此类问题的关键就是要找出它所对应的背景函数,对照背景函数的性质和图像,通过类比、猜想,从中理出解题思路。
The abstract function is characterized by abstract nature and hidden image. The key to solving this kind of problem is to find the corresponding background function, and to analyze the nature and the image of the background function through analogy and guess.