我们知道，实系数一元二次方程ax2＋bx＋c＝0的根的情况，可由根的判别式△＝b2－4ac来判定，有如下根的判别式法则：定理1实系数一元二双方程ax2＋bx＋c＝0，其中a、b、c∈R，a≠0，当△＞0时，方程有两个不相等的实根；当△＝0时，方程有两个相等的实根；当△＜0时，方程有两 We know that the root of the real coefficient quadratic equation ax2+bx+c=0 can be determined by the root discriminant △=b2-4ac. There is a root discriminant rule: Theorem 1 Real coefficient Coefficient One-by-two-double equation ax2+bx+c=0, Among them, a, b, c∈R, a≠0, when △>0, the equation has two unequal real roots; when Δ=0, the equation has two equal real roots; when △<0, There are two equations