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一元二次方程的判别式及根与系数的关系是初中数学中的重点内容之一,同学们在应用时,常常忽视方程ax2+bx+c=0的“a”与“△”,错误有以下几种情况:
The discriminant of the quadratic equation and the relationship between the root and the coefficient are one of the key contents of junior high school mathematics. When students are applying, they often neglect the “a” and “△” of the equation ax2+bx+c=0. The following situations: