最近在五年级期末的测试中有这样一道判断题:循环小数0.31等于0.313131是否正确,这个题本没什么问题,学生只要抓住循环小数的定义,依次循环下去就可以知道是相等的,问题主要出在①学生认为两个循环小数的循环节不同; Recently in the fifth grade end of the test there is such a judgment: the cycle of 0.31 is equal to 0.313131 decimal fraction is correct, this question no problem, as long as the students grasp the definition of a cyclic fraction, followed by the cycle can know is equal to the main problem In ① students think the cycle of two different parts of the cycle is different;