第一句：让学生记住一个规则是很容易的
第二句：用这些规则解决一些问题是很难的.
It's adj.for sb to do sth 固定结构,是第一句的.
第二句也可以用,要改就是：It is very difficult for the students to use these rules to solve some problems
第二句的第二个TO,是作目的状语的,和这个固定结构无关.FOR的后面要接动作的执行者.
It is very easy for the students to memorize some rules.It i
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