下列计算正确的是( ) A.a2•a3=a6 B.(﹣2ab)2=4a2b2 C.(a2)3=a5 

下列计算正确的是(  )

Aa2•a3=a6 B.(﹣2ab2=4a2b2

C.(a23=a5     D3a3b2÷a2b2=3ab

答案

B

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