贵刊93年7-8合刊上所发表的《二次方程在区间上有实根的条件及应用》一文中，提到方程f（x）=ax~2十bx十c＝0（a≠0）在区间（a，β）内有一实根或两实根（包含重根）的充要条件是我们将指出，这一结论的第一部分是错误的．举一个简单的例子，就可说明问题：例如二次方程X~2-3X In the article “Quarutic equations with real roots in the interval and its applications” published in the 7-8 edition of the Journal of yours in 1993, we mentioned the equation f(x) = ax~2 and ten bx ten c = 0 (a ≠ 0) The necessary and sufficient condition for having a real root or two real roots (including multiple roots) in the interval (a, β) is that we will point out that the first part of this conclusion is wrong. A simple example illustrates the problem: for example, the quadratic equation X~2-3X