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分式的概念及分式求值是初中数学的重要内容,其常见题型为以下两个方面的内容:(1)已知分式有意义或无意义时,求所含字母的取值范围;(2)已知所求的分式的值为0,求所含字
The concept of fractions and the evaluation of fractions are the important contents of junior high school mathematics. The common questions are the following two aspects: (1) When the known fractions are meaningful or insignificant, ask for the range of letters included. (2) Known to find the value of the fraction is 0, find the contained words