2的0次方和

更新时间: 2020-07-07 00:00:00     

任何数的0次方都等于1,不论是定义还是规定都必须是合理的,完全可以解释,当我们只考虑正整数指数幂时,有一条运算法则,同底幂的商,底数不变,指数相减,但是,经常会遇到两个底数与指数分别相同的幂的除法运算,就是说在上面的那个式子中出现了左边等于右边的情况,于是考虑等号左边显然应当是1;右边如果仍然是“底数不变,指数相减”,就出现了零指数幂,这样就规定“任何非零数的0次幂都等于1”,至于为什么规定中限制底数非零,那是因为等号左边是除法运算,分母不能为零,所以规定底数不等于零。

关键词: 次方

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