The difference, sum, quotient and product of a natural number and its subtraction, addition, division and multiplication add up to exactly 8. The natural number is ()

Let this number be a
（a-a）+（a+a）+（a×a）+（a÷a）
=a²+2a+1
=(a + 1) &# 178; is a complete square number,
∵ 8 is not a perfect square number, so a cannot be a natural number

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