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200 ( ) 100 ( ) 99 ( ) 60 ( ) ()
()
144 216 ( ) −96 ( ) [MAΘ 2011]
−216 ( ) 10 5 . 324
0 ()
24 3 ( ) 24 1 ( ) 23 1 ( ) 22 1 ( )
4 4 2 2
85 ( ) [MAΘ 2011] ( )
4()
15 + 16 + 17 + + n = 15n −6 ( )
n (
35 ( ) 21 ( )
70 ( ) −1 ( )
5,k,k 2 − 8 k )
.
3( ) 2( )
. an = 71 − 7n ( )
2 )
−200
68 ( ) 67 ( )
69 ( ) [MAΘ 2011] (
21
28 ( ) 7+ 2 ( ) 33 ( ) 8 ()
3 4
