提及对称性，人们往往注意到的是图形的对称性，而忽视数学式的对称性．数学美中的对称美，其实蕴含着图和式这两个方面的对称美．一旦我们能发掘并利用其对称的性质，常常能收到简单、奇异的解题功效．因此，在解题和教学的过程中，我们应注意渗透和利用对称思想，培养和发展 Referring to symmetry, people often notice the symmetry of the graph and ignore the mathematical symmetry. The beauty of beauty in mathematics and beauty, in fact, contains the symmetrical beauty of the two aspects of graphs and formulas. Once we can explore and use its symmetry properties, we can often receive simple, singular solution problems. Therefore, in the process of solving problems and teaching, we should pay attention to infiltrate and use symmetry ideas to cultivate and develop