How many odd perfect squares are between 5 and 211?
问题描述：
How many odd perfect squares are between 5 and 211?
答
3的平方数是9
14的平方数是196
这之间3、5、7、9、11、13的完全平方数是奇数
因此有6个
答案是there are six odd perfect squares between 5 and 211.