2 . ' . 3 [( ( ) ( )]
MA MA MB MC MG b c a a c b a
9 2 4 2 2 2 2
2 2
b c
1 9
2 2 2 2 2 2 2 2 2
MG b c a a a c b a
3 (2 2 )
9 2 2 2
1 3 3 3
2 2 2 2
MG a b c
3 ( )
3 1 ( )
6
2 2 2
a b c
2
MGđ
3 ( pcm)
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