下列计算正确的是 ( )
( a 4 b ) 3 = a 7 b 3
- 2 b ( 4 a - b 2 ) = - 8 ab - 2 b 3
a a 3 + a 2 a 2 = 2 a 4
( a - 5 ) 2 = a 2 - 25
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