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一、分式的基本概念一般地,如果A、B表示两个整式,并且B中含有字母,那么式子叫做分式。分式A/B中,A叫做分子,B叫做分母。掌握分式的概念应注意:1.分式的分母中必须含有未知数。2.分母的值不能为零,如果分母的值为零,那么分式无意义。3.分式有意义、无意义,分式的值为零的条件:分式有意义的条件是分式的分母不为0;分式无意义的条件是分式的分母为0;分式的值为0的条件是分子为0,且
First, the basic concept of fractional In general, if A, B said two integers, and B contains letters, then the formula is called fractional. In fraction A / B, A is called a numerator and B is called a denominator. Grasp the concept of fractional should pay attention to: 1. Fractional denominator must contain unknowns. 2. The denominator value can not be zero, if the denominator value is zero, then the fractional meaningless. 3. Fraction meaningful, meaningless, fractional value is zero conditions: Fractional meaningful condition is the fractional denominator is not 0; fractional meaningless condition is the fractional denominator is 0; fractional The condition of a value of 0 is that the numerator is 0, and