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3, 8, 15 .

d 4( ) rd 3 ()
[MAΘ 2010] (
5() 7( )

ab ≠ 0 )

a,a + b 3,a + b 6

m +n a = − 3 ( m +n)
b 2

5() 4( ) 3( ) 2 ()
.
a,b,c [AHSME 1963] ( )
b )
. c 2a 1 )
14 ( ) )
12 ( ) 10 ( ) 8 ()

[AHSME 1981] (

. 91 67

34 ( ) 32 ( ) 30 ( ) 28 ( )

29 2 [AHSME 1966] (

13 ( ) . 155

9 27 ( ) 2( ) 3 ()

19 An [AHSME 1966] (
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