计算:![]()
.                                             
计算:![]()
.                                             
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.