下列计算正确的是（）A． x2+x3=x5 B．（x3）3=x6 C． x•x2=x2 D． x（2x

下列计算正确的是（　　）

　 A． x²+x³=x⁵ B．（x³）³=x⁶ C． x•x²=x² D． x（2x）²=4x³

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下列计算正确的是（ ）A． x2+x3=x5 B． （x3）3=x6 C． x•x2=x2 D． x（2x

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下列计算正确的是（）A． x2+x3=x5 B．（x3）3=x6 C． x•x2=x2 D． x（2x