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下列运算正确的是( )
a 2 • a 3 = a 6
( a 2 ) 3 = a 5
(﹣ 2 a 2 b ) 3 =﹣ 8 a 6 b 3
( 2 a + 1 ) 2 = 4 a 2 + 2 a + 1
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