论文部分内容阅读
我们知道,对于实系数一元二次方程ax2+bx+c=0,其根的判别式为Δ=b2-4ac,当Δ>0时,方程有2个不相等的实数根;当Δ=0时,方程有2个相等的实数根;当Δ<0时,方程没有实数根.所以有关一元二次方程或能转化为一元二次方程的题目,可以考虑用判别式法.
We know that for the real coefficient quadratic equation ax2+bx+c=0, the root discriminant is Δ=b2-4ac. When Δ>0, the equation has two unequal real roots; when Δ=0 The equation has two equal real number roots; when Δ<0, the equation has no real number roots. Therefore, regarding the quadratic equation or the one that can be converted into a quadratic equation, the discriminant method can be considered.