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3 ): -% ! = !> 38 3 ):
( 6! ? ;< "9 " /! 3 4! * $(
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a c 0 ) c a ( 3 c a 0 u AC u
D AB=(b−a,(b+a) 3), CB=(b+ a, (b+ a) 3)// (1, 3)=v
2
a b 0 v AB CB
2
3 a , 2
a (
2
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3 a S
a 4
a 27 4
a BC , 3 a 4
a 4
a AB
2 ABC
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2 AC ) 1 , 3 ( AC ) 2 , 3
2 ( C ), 1 , 3
1 ( A 3
1 a 3
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R = = !2 +
2
3 y ( ) 3 2
1
x
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