韦达定理在解答初中数学问题中有着极其重要的作用.历年来各地中考试题都有涉及,现举例谈谈它在初中代数中的应用.一、已知一元二次方程的一个根,求另一根例1已知方程x2-6x=-1的一个根为3-2*2~(1/2),求另一个根.分析本题可直接解方程求出另一根,但如果应用韦达定理可更快解决.应用时应把方程化为一般形式ax2+bx+c=0(a≠0).根据选择使得到另一根易于计算的原则,酌 Vedic theorem plays an extremely important role in solving the math problems of junior high school.All the middle school exam questions have been involved in the past years, and now it is an example to talk about its application in junior high school algebra. An Example 1 Known equation x2-6x = -1, a root is 3-2 * 2 ~ (1/2), find another root. Analysis of the problem can be directly solve the equation to find another, but if the application of Wei Up to theorem can be solved more quickly.Application should be the general form of the equation ax2 + bx + c = 0 (a ≠ 0) .According to the selection to another easy to calculate the principle of discretion