一、理解法则的条件同底数幂的除法法则:同底数幂相除,底数不变,指数相减;即am÷an=am-n(a≠0,m、n都是正整数且m>n)。1.在所给的条件中,要注意底数必须相同,且特别强调了a≠0,这是因为:若a=0,则an=0n=0,而“0”不能作除数,所以a≠0。2.从m、n是正整数的情况时概括出同底数的除法法则的,但对负整数指数幂同样适用。没有涉及到分数指数幂等 First, the conditions of understanding the law with the end of the law of the power of division: the same base power is divided, the same base, index subtraction; that am ÷ an = am-n (a ≠ 0, m, n are positive integers and m> n ). 1. In the given conditions, pay attention to the base must be the same, and with special emphasis on a ≠ 0, because: If a = 0, an = 0n = 0, and “0” can not be used as a divisor, so a ≠ 0.2 From m, n is a positive integer case of generalization of the same base division rules, but the negative integer exponential power is equally applicable. There is no point exponential exponential