二次函数是初中代数的重点内容,但由于它比正、反比例函数及一次函数复杂,且研究的性质又较多,所以学生学起来感到困难较大。要解决他们的实际困难,除了要重视二次函数的定义、图象与性质的教学以外,下面几个问题也应引起注意。 The quadratic function is the key content of junior high school algebra, but because it is more complex than the positive and negative proportional functions and the primary function, and the nature of the research is more, the students are more difficult to learn. To solve their practical difficulties, in addition to paying attention to the definition of the quadratic function, the teaching of the image and the nature, the following issues should also attract attention.