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. 160

8() 5( ) −5 ( ) −5 ( ) )
)
361 ( ) 2 2 [MAC12 2002] ( )
18 .
15 ( ) 289 ( )
225 ( ) 169 ( )
16 5()
2, y, 6 1 , x, y, 2 [MAΘ 2007] (
12 4 27
d x +y

5( ) 11 ( )
36
18

2, x, 6 (

3r .r
d 5( )

5() 3( ) 2 3 ()

2 2 )
)
[MAΘ 2007] (

a +b +c S6 = a b + c .8

63 ( ) 24 ( ) 16 ( ) 12 ( )

d [MAΘ 2009] (

.S8 = 16 a1 = −5

( )1 d + d2 + d 3 + d 4 + d 5 + d6

18

7 () 31 ( ) 6( ) − 31 ( )

9 9