题目
Problem
A student was asked to prove by contradiction that
“there are no positive integers and such that ”
The start of the student’s proof is shown in the box below.
Show the calculations and statements that are needed to complete the proof.
(4)
题目中文翻译
一名学生被要求用反证法证明：
“不存在正整数 和 使得 ”
该学生证明的开头已在下框中给出。
写出完成该证明所需要的计算和论述。