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一元二次方程根的判别式△=b~2-4ac是初中数学中的一个重要的知识点,也是各地中考的一个热点.利用它可以不解方程来判别一元二次方程根的情况,还可以根据一元二次方程根的情况确定有关字母系数的取
Discriminant of root of quadratic equation △ = b ~ 2-4ac is an important knowledge in junior high school mathematics, but also a hot spot in the test. Use it to discriminate equations without solving the equation quadratic root of the situation, but also You can determine the number of letters based on the quadratic root equation