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Ex.1:

a)
$z_{11}=23/8$, $z_{12}=z_{21}=19/8$, $z_{22}=31/8$;
b)
$y_{11}=31/44$, $y_{12}=y_{21}=-19/44$, $y_{22}=23/44$;
c)
$h_{11}=44/31$, $h_{12}=19/31$, $h_{21}=-19/31$, $h_{22}=8/31$;



Sergio Jesus 2003-12-07