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Tính A
$A=\left(1-\dfrac1{2^2}\right)\left(1-\dfrac1{3^2}\right)\left(1-\dfrac1{4^2}\right)\cdots\left(1-\dfrac1{2017^2}\right)$
giúp mình cảm ơn ạ
$A=\left(1-\dfrac1{2^2}\right)\left(1-\dfrac1{3^2}\right)\left(1-\dfrac1{4^2}\right)\cdots\left(1-\dfrac1{2017^2}\right)$
giúp mình cảm ơn ạ
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