4. -
(a) , , ;
(b) 28
(c) , , , ( ) , .
II
5. (1) , .
(2) , -
(a) - , -
(i) , , (3);
(ii) , (3);
(b) , (3);
(c) ;
(i) , ( ), , , ;
(ii) (3)
(3) -
(a) , ;
(b) ;
(c) ;
(i) (4) , 1-6 1
(ii) (4) , 1-3 1
(4) , 2 1 1997a.
(5) , -
(a) ( ), ,
(b) , .
6.- (1) .
(2)
(a) , ;
(b) , .
(3)
(a) , ;
(b) , .
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7.- (1) , .
(2) , -
(a) , ;
(b) , ,
(i) , , ,
(ii) ;
(c) ;
(i) (4) , 1-6 1;
(ii) (4) , 1-3 1.
(4) , 2 1 1997b.
8.- (1) -
(a) , , ,
(b) , ,
( ) , .
(2) -
(a) , -
(b) , , -
(c) , , -
, , , .
(3) , .
