3
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Let $m$ and $n$ satisfy $mn=4$ and $m+n=5$. What is $|m-n|$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
3
Let $m$ and $n$ satisfy $mn=4$ and $m+n=5$. What is $|m-n|$?
train