Partea intreaga a numarului[tex]\dfrac{1}{1-x}, unde \: x = \dfrac{3}{1^{2} \cdot2^{2} } +\dfrac{5}{2^{2} \cdot3^{2} } +\dfrac{7}{3^{2} \cdot4^{2} } +.....+\dfrac{4041}{2020^{2} \cdot2021^{2} }[/tex] este egala cu ?