判别式与韦达定理是中考命题中的热点，在解答与它们有关的问题时，一定要重视隐含条件，若注意不到或挖掘不彻底，就会导致错误.例1已知关于x的方程（1-2k)x2-2k+1摇姨x-1=0有两个不相等的实数根，求k的取值范围.误解∵摇方程有两个不相等的实数根，∴△0，即(2k+1摇姨)2-4(1 Discriminants and Weddah’s theorem are hot topics in the examination propositions. When answering questions related to them, we must pay attention to implied conditions. If we do not notice or incomplete digging, it will lead to errors. Example 1 Known about x The equation (1-2k)x2-2k+1 rocking x-1=0 has two unequal real roots and finds the range of k. It is misunderstood that there are two unequal real roots in the equation, ∴△0 , (2k+1 shake) 2-4 (1