T
thuong_000


Các bạn giúp mình nhé :
$A=\dfrac{2^2-1}{2^2}.\dfrac{3^2-1}{3^2}.....\dfrac{n^2-1}{n^2}$
$A=\dfrac{2^2-1}{2^2}.\dfrac{3^2-1}{3^2}.....\dfrac{n^2-1}{n^2}$
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