如何学好分式的概念

• 作 者: 杨佩
• 机 构: 江苏
• 出 处: 中学生数理化(初中版)
• 发表日期: 2004年Z1期
• 关键词: 一宁 制约条件 喜中

一、注意分数、分式的区别任何整数都可以看成是分母为1的分数,如-2可以看成分数-2/1,但任意整式就不能看成分母为1的分式,即整式2-1就不能看成分式。在运算中分数和整数可以转化,如2=4/2,-4/2=-2,而在整式与分式之间就不能无条件地随意转化了,如m2/2m不能随意化为m/2,(x-2)2/x-2不能随意化为x-2.

First, pay attention to the difference between scores and fractions. Any integer can be regarded as a fraction with a denominator of 1. For example, -2 can be read as a fraction number - 2/1, but an arbitrary integer can not see fractions with a parent element of 1, ie, integers. 2-1 can’t see composition. In the operation, the scores and integers can be converted, for example, 2=4/2, -4/2=-2, and they cannot be transformed freely and unconditionally between the whole equations and the fractions. For example, m2/2m cannot be arbitrarily converted to m/. 2, (x-2)2/x-2 cannot be arbitrarily converted to x-2.