不等式证明方法多样,必须具体问题具体分析。用图象法证明不等式能使学生获得具体、鲜明、直观的效果。特别是学生目前尚未学过微积分初步知识的情况下更觉有可取之处(当然要求图象作得尽量精确)。这种方法能让学生从图象上看出不等式左右两边的内在联系,找到深刻的几何根源。 The inequality proves a variety of methods and must be specifically analyzed on specific issues. Using the image method to prove inequality can enable students to obtain concrete, vivid and intuitive results. Especially when students have not yet learned the initial knowledge of calculus, they are more adept at it (of course they require the image to be as accurate as possible). This method allows the students to see the intrinsic relationship between the left and right sides of the inequality from the image and find the deep geometric roots.