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28 ( ) 24 ( ) 20 ( ) 13 ( )
[AMC82007] (
)
. 100
.
96 ( ) 79 ( ) 64 ( ) 2 ()
. 150 [AMC82008] ( )
. 30
60 ( ) 50 ( ) 40 ( ) 30 ( )
. 1441 [AMC82008] ( )
. 2291
85 ( ) 80 ( ) 75 ( ) 70 ( )
:
M +N 3 = M = 60 [AMC82008] ( )
127 ( ) 5 45 N 27 ( )
28 45 ( ) 29 ( ) [AMC82008] ( )
4
.7
