(2011山东济南,5,3分)下列运算正确的是( )A.a2•a3=a6B.(a2

(2011山东济南,5,3分)下列运算正确的是( )
A.a2•a3=a6B.(a23=a6C.a6÷a2=a3D.23=﹣6

答案

B解析:
A、应为a2•a3=a2+3=a5,故本选项错误;
B、(a23=a2×3=a6,正确;
C、应为a6÷a2=a62=a4,故本选项错误;
D、应为,故本选项错误.
故选B.

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