下列计算正确的是（　　）                                           ...

问题详情：

下列计算正确的是（　　）                                                                     

A．    B．xy2÷                                  

C．2         D．（xy3）2=x2y6             

【回答】

D【分析】分别利用二次根式加减运算法则以及分式除法运算法则和积的乘方运算法则化简判断即可．                  

【解答】解：A、无法化简，故此选项错误；                                             

B、xy2÷=2xy3，故此选项错误；                                                          

C、2+3，无法计算，故此选项错误；                                            

D、（xy3）2=x2y6，正确．                                                                      

故选：D．                                                                                         

【点评】此题主要考查了二次根式加减运算以及分式除法运算和积的乘方运算，正确掌握相关运算法则是解题关键．                                                                          

知识点：各地中考

题型：选择题