分类：教育/科学-外语学习
问题：N次的N用英文全称怎么说 
N次的N用全称怎么说
回答：直接读n,不是缩写.

n:    (MATHEMATICS)[数学]   
noun [U][不可数名词]
1 used in mathematics to mean a number whose value is not known or not stated:
用于数学表示一个不未知或未给出的数
If 3n = 12, what is the value of n?
如果3乘n =12,那 n是多少?

2 used more generally to represent a number that is not known or exact
比较普遍用来代表未知或不确定的数字

(from Cambridge Advanced Learner's Dictionary)