7) (\(\sqrt{\dfrac{3}{2}}\) - \(\sqrt{\dfrac{2}{3}}\)) : \(\dfrac{1}{\sqrt{6}}\)

8) ( 1+ \(\sqrt{2}\)  + \(\sqrt{3}\) ) ( 1 + \(\sqrt{2}\) - \(\sqrt{3}\) )

6) (3\(\sqrt{2}\) -\(\sqrt{3}\))(\(\sqrt{3}\)+3\(\sqrt{2}\))

7) \(\sqrt{72}\)+\(\sqrt{4\dfrac{1}{2}}\) - \(\sqrt{32}\) - \(\sqrt{162}\)

4) A = 3.\(\sqrt{2}\)+ 4.\(\sqrt{8}\)-\(\sqrt{18}\)

5) ( \(\sqrt{12}-\sqrt{48}-\sqrt{108}-\sqrt{192}\) ) :2\(\sqrt{3}\)

1)\(\dfrac{1}{2-\sqrt{6}}\)-\(\dfrac{1}{2+\sqrt{6}}\)

3)\(\)\(\sqrt{27a}.\sqrt{3a}\left(a>0\right)\)

rút gọn 

1.  When Tet holiday comes, Vietnamese people often feel inclined to                  their houses.

A. do up                            B. do through                 C. do over                        D. do in

2.  Bob has a bad lung cancer and his doctor advised him to                  smoking.

A. turn up                          B. give up                       C. take up                        D. put up

3.  When he realized the police had spotted him, the man                  the exit as quickly as possible.

A. made off                       B. made for                    C. made out                     D. made up

4.   The government is thinking  of bringing                   a law to make it compulsory for cyclists to wear crash helmets.

A. on                                 B. up                              C. in                                 D. round

5.  Susan was alone in the house when the fire                 

A. broke out                      B. broke down               C. broke up                      D. broke away.

1.      The new government has brought                      many changes.

A. about                            B. round                         C. up                                D. off

2.      She used to be thin, but she is filled                      a lot.

A. in                                  B. into                            C. up                                D. out

3.      Let us do                      these regulations.

A. away with                     B. over                           C. up                                D. for

4.      As I have just had a tooth                    , I am not allowed to eat or drink anything for three hours.

A. taken out                      B. crossed out                C. broken off                   D. tried on

5.      The woman                      when the police told her that her son had died.

A. got over                        B. fell apart                    C. looked up                    D. broke down

1.  We must make                  some stories to explain our absence.

A. out                                B. away                          C. off                               D. up

2.  I ran                  George in the library.

A. out of                            B. over                           C. through                       D. into

3.  You need a rest; you look run                 

A. through                         B. over                           C. down                           D. up

4.  He puts                  some money every week.

A. away                             B. up                              C. off                               D. out

5.      Our dog has been run                  by a car.

A. over                              B. down                         C. into                              D. through

6.      You may not like the noise, but you will have to put