分式的加减运算经常涉及到通分.对于一些特殊的分式加减题,若按照常规方法进行通分,运算往往比较复杂.如果能够根据题目本身的特点,巧妙地运用通分技巧,不仅可以化难为易,而且还能减少出错机会.下面举例说明,供同学们参考. Fractional addition and subtraction operations often involve pass points.For some special fractional addition and subtraction problems, according to the conventional method of pass points, the operation is often more complex.If you can according to the characteristics of the subject itself, clever use of pass points skills, Not only can be difficult for the easy, but also reduce the chance of error. The following examples, for students to reference.