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在中考或其它竞赛题目中,常把分式与求值计算联系在一起考,这类题目常使相当一部分学生感到难度大,本文就教学中的一些经验,列举数例进行解析,供读者参考.例1设x,y,z为三个互不相等的实数,且x+1y=y+1z=z+1x,求x2y2z2的值.解先拿已知条件的前一个等号试探一下有:x-y=1z-1y=yz-yz
In the middle school entrance examination or other competition topics, it is often linked to the calculation of the evaluation, this type of topic often makes a considerable number of students feel difficult, this article on the teaching of some of the experience, cited a number of examples for analysis, for readers reference Example 1 Let x, y, and z be three real numbers that are not equal to each other, and x+1y=y+1z=z+1x, find the value of x2y2z2. The solution takes the previous equal sign of the known condition to test it. :xy=1z-1y=yz-yz