n-3/n-2 €Z =>n-3 chia hết cho n-2
=>n-2-1 chia hết cho n-2
mà n-2 chia hét cho n-2 nên 1chia hết cho n-2
n-2€Ư(1)=> n-2€{1,-1}
Vậy n€{-1,-3}
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