题目

计算：．                                             答案：解：原式=3﹣+2（﹣）                                                      =3﹣+6﹣4                                                                                     =5﹣．                                                                                           【点评】此题考查二次根式的混合运算，在进行此类运算时，一般先把二次根式化为最简二次根式的形式后再运算．                                                                           　                                                                                                      

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