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下列计算正确的是 ( )
a − ( b + c ) = a − b + c
a 2 + a 2 = 2 a 2
( x + 1 ) 2 = x 2 + 1
2 a 2 ⋅ ( − 2 a b 2 ) 2 = − 16 a 4 b 4
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