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下列运算正确的是 ( )
A. 3 x 2 + 4 x 2 = 7 x 4 B. 2 x 3 ⋅ 3 x 3 = 6 x 3
C. a ÷ a − 2 = a 3 D. ( − 1 2 a 2 b ) 3 = − 1 6 a 6 b 3
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