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一元二次方程是初中数学“数与代数”这一板块中的重要内容,是在学习一元一次方程、二元一次方程组、分式方程的基础上的延续、深化和提高,选用恰当的方法解题,能起到事半功倍的效果,现举例剖析如下.一、抓特点,选方法,用适当的方法解一元二次方程选择一元二次方程的解法时,要抓住方程的特点,尽量选择简便的方法,既能提高解题速度,又不
The quadratic equation of the junior middle school is an important part of the mathematics of “junior high school” and “number and algebra”. It is based on the continuation, deepening and improvement of learning a one-linear equation, binary one-time equation system and fractional equation, Method to solve the problem, can play a multiplier effect, now an example of the analysis as follows: First, grasp the characteristics of the election method, the appropriate method for solving the quadratic equation of the dollar quadratic equation solution, we should seize the characteristics of the equation, Try to choose the easy way, both to improve the speed of problem-solving, not