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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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