本期担任高三代数,講到二次方程的讨論一章时,对解二次方程关于根的符号問題,有所体会,提出来,供教师們参考。教本上是根据根的公式来討論兩根为不等实根时,何时兩根同为正,兩根同为負,为異号根,这样的討論,由于学生对絕对值的观念不很 In this issue, I served as a senior third-generation algebra. When I talked about the quadratic equation in the chapter of discussion, I have some understanding of the quadratic equation about the root symbol and I came up with it for teachers’ reference. When the textbook is based on the root formula to discuss two unequal real roots, when two roots are positive and two roots are negative, they are different roots. This discussion is due to the student’s notion of absolute value. very