toán học

H

huytrandinh

$=(t^{2}-\dfrac{1}{4})$.......................................................................
 
N

noinhobinhyen

$1+4x=t^2 \Rightarrow x=\dfrac{t^2-1}{4}$

$x \in Z \Leftrightarrow $ t lẻ.

vậy $x=\dfrac{t^2-1}{4} \forall t=2k+1 (k \in Z)$
 
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