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下列等式错误的是( )
A. ( 2 mn ) 2 = 4 m 2 n 2 B. (﹣ 2 mn ) 2 = 4 m 2 n 2
C. ( 2 m 2 n 2 ) 3 = 8 m 6 n 6 D. (﹣ 2 m 2 n 2 ) 3 =﹣ 8 m 5 n 5
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