(2/4)² x [0,(4)+5/7:10/14 ]² =
=(1/2)² x [4*9+5/7 x14/10 ]² =
=1/4 x (4/9+1)² =
=1/4 x [(4+9)/9]² =
=1/4 x 13/9² =
=1/4 x1169/81=
=1169/324
sau
2/(4)² x [0,(4)+5/7:10/14 ]² =
=2/16 x [4*9+5/7 x14/10 ]² =
=1/8 x (4/9+1)² =
=1/8 x [(4+9)/9]² =
=1/8 x 13/9² =
=1/8 x1169/81=
=1169/648