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在讲一元二次方程的解法3(配方法,二次项系数不为1)这节课时,从头到尾我总共说话的时间不超过5分钟。起因在于讲一元二次方程的解法2这节课(配方法,二次项系数为1)时,有学生问道:“那二次项系数不为1时怎么办呢?”我顺手在黑板上写下3x2+2x-1=0,并问学生:“这个方程怎么解呢?”有很多的学生都认为先两边都除以3,把二次项的系数化为1,再配方就可以解
Speaking of the quadratic equation solution 3 (with the method, the quadratic coefficient is not 1) this class, I speak from the beginning to the end of the total time not exceeding 5 minutes. The reason is that the solution to a quadratic equation 2 This lesson (with the method, the quadratic coefficient is 1), some students asked: “What should I do when the quadratic coefficient is not 1? Write 3x2 + 2x-1 = 0 on the blackboard and ask the student: ”How do you solve this equation?" Many students agree that dividing the first two sides by 3 and the second term by 1, Formula can be solved