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方程是刻画现实世界数量关系的有效模型。学生已经学习了一元一次方程、二元一次方程组、可化为一元一次方程的分式方程等知识,感受了方程模型的作用和价值,积累了一些利用方程解决问题的经验。但方程模型是丰富多彩的,一元二次方程是以前学过的方程知识的延续和深化,它在现实生活以及数学中同样有着广泛的应用,也是以后学习其他数学知识的基础。一元二次方程的知识重点可归纳为:1.解方程:作为本章的重点,它的许多内容反
Equation is an effective model to describe the relationship between the numbers in the real world. Students have learned a one-time equation, a bivariate linear equations, a fractional equation that can be turned into a one-dollar one-equation equation, etc., have experienced the role and value of the equation model and accumulated some experience in solving equations using equations. However, the equation model is rich and colorful. The quadratic equation is a continuation and deepening of the previously learned equation knowledge. It also has a wide range of applications in real life and mathematics, and is also the basis for learning other mathematical knowledge in the future. The emphases of the univariate quadratic equations can be summarized as follows: 1. Solve the equation: As the focus of this chapter, many of its contents