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下列运算正确的是 ( )
( a + b ) ( a - 2 b ) = a 2 - 2 b 2
( a - 1 2 ) 2 = a 2 - 1 4
- 2 ( 3 a - 1 ) = - 6 a + 1
( a + 3 ) ( a - 3 ) = a 2 - 9
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