1. 1. 1
2. 2.
3. 3.
4. 4. , , , ,
5. 5. :- :
6. 6. ( . .) = (. .) = (. .) = ( .) = (. .) = (. .) = (. .) = = = = = =
7. 7.
8. 8. : : = ( ) = () = : =( )
9. 9.