Chứng minh rằng với mọi số tự nhiên $n$, luôn tồn tại duy nhất đa thức $f(x)$ thỏa mãn đồng thời hai điều kiện:

$1)$ Hệ số của $f$ thuộc $\{ 0,1,2,..,9 \}$

$2) f(-2)=f(-5)=n$ 

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