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通分是分式加减运算的主要环节,其方法灵活,技巧性大,综合性强,在进行加减运算时,若不加分析地采用一次性通分,往往运算较繁.但若根据各分式分子、分母的结构特点、灵活巧妙地采取相应的通分方法和解题技巧,则可化繁为简,化难为易,达到了事半功倍之效,请看下面的例子,供参考.一、逐步通分当分式各分母按一定规律分布且存在某种递进关系,一次通分难度较大时,可采取逐步通分.
Passing is the main part of the fractional addition and subtraction, the method is flexible, highly skilled, comprehensive, in the addition and subtraction operations, without analysis using one-pass pass, often complicated operation, but according to The structural features of the fractional numerator and denominator, flexible and clever to take the appropriate method and problem-solving techniques, can be complicated, easy, to achieve a multiplier effect, see the following example for reference. First, the gradual pass points When the fractional denominator distribution by a certain law and there is some progressive relationship, a pass points difficult, you can take a step-by-pass.