4.2 = . (1 )5. x = 4 x = (2 )6. 1+ = (2 )7. .. (2 )8. = 3 x = (1
)9. x =. (1 )10. x 4 = 8 x =.. (2 )11. 2x-4 = (2 )12. b b = 0 b =
(2 )13. (2 )
14. x + y =17x y = 1 =. (2 )15. = 7 = 25
(3 )
16.
ABCD . (1 )17.
..(2 )
18.
AB = BC = CD = 28 (3 )19. ABC 60 AB 10 A = B cosA =(2 )20. ABC c
AB 4 A = 30 BC . (2 )21. x x = 16 y=5 x = 64 y =.. (2 )22.
Pre-Olympaid 450 115 143 280 .. (2 )23. 10 18 900 (2 )24. v () p .
(1 )q (1 )r . (1 )25. x , y (, 6) = ( x+y = (2 )26. g(x) = a a2-5 =
0 g(2a+1) = (3 ) 2 27. 16 6 (4 )28. 30 8 60 (4 )
