韦达定理是初中数学的重要内容,大家不仅要学会顺用、逆用,还要善于挖掘条件巧用。一些问题表面上看似乎与韦达定理无关,若能认真分析,挖掘出题目中的隐含条件,构造韦达定理的模型,巧用韦达定理来解,往往能收到意想不到的效果,今举几例。 The Weddah Theorem is an important part of junior high school mathematics. We must not only learn to use it, reverse it, but also be good at excavating conditions. Some problems on the surface seem to have nothing to do with Vedic’s theorem. If we can carefully analyze, dig out the implicit conditions in the title, construct the model of Vedic theorem, and use Vedic theorem to solve it, we can often receive unexpected results. Here are some examples.