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异分母分式的加减法是分式运算的重点和难点,必须切实掌握,其方法是先通法,后巧法.一、运用通法,掌握异分母分式的加减法的一般步骤(1)把各分式的分母分解因式;(2)确定各分式的最简公分母;(3)运用分式的基本性质化异分母为同分母;(4)进行计算,并将最后结果化为最简分式.例1计算
The addition and subtraction of the different denominator fraction is the key and difficult point of the fractional operation. It must be grasped in a practical way. The method is the first pass and then the clever way. First, use the general method to grasp the general steps of the addition and subtraction of the different denominator fraction. (1) Decompose the factors of the denominators of each fraction; (2) Determine the simplest common denominator of each fraction; (3) Apply the fractional basic nature of the denominator to the same denominator; (4) Calculate and The final result is reduced to the simplest. Example 1 Calculation