分式是在整式的基础上发展起来的另一类代数式．与整式相比，分式的概念性更强，运算步骤增多，符号变化更为复杂，方法也较灵活．分式是今后学习其他知识必不可少的基础知识．由于分式与分数的性质和运算有许多类似的地方，所以在学习过程中要注意与分数对比起来学．正确理解 Fractional is another type of algebraic expression developed on the basis of integers. Compared with the whole formula, the fractional concept is stronger, the number of calculation steps is increased, the symbol change is more complicated, and the method is more flexible. Fractional is the basic knowledge necessary to learn other knowledge in the future. Because there are many similarities between the properties and operations of fractions and scores, it is important to pay attention to the comparison with scores in the learning process. Correct understanding