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我们很容易判别一元二次方程ax~2+bx+c=0是否有实根.当判别式⊿=b~2-4ac>0时,有两个不相等的实根,当⊿=0时,有两个相等的实根;当⊿<0时,则方程没有实根。有实根的二次方程与无实根的二次方程都有无穷多
We can easily determine if the quadratic equation ax~2+bx+c=0 has a real root. When the discriminant formula ⊿=b~2 - 4ac > 0, there are two unequal real roots, when ⊿ = 0. There are two equal real roots; when ⊿ < 0, the equation has no real roots. There are infinitely many quadratic equations with real roots and quadratic equations without real roots.