Cho biểu thức :

A=$\frac{a^{3}+2a^{2}-1}{a^{3}+2a^{2}+2a+1}$

a) Rút gọn biểu thức trên.

b) Chứng minh rằng nếu $a$ là số nguyên thì giá trị của biểu thức tìm được của câu $a$ là $1$ phân số tối giản.
$A=\frac{a^2+a-1}{a^2+a+1}$
phần b tự lm đi!

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