3x-y=2

5x+y=6 

giải pp thế, (đừng làm tắt quá nha)

giải phương trình

a) \(\sqrt{x-5}\)+\(\sqrt{4x-20}\)-\(\dfrac{1}{5}\)\(\sqrt{9x-45}\)=3

b) \(\sqrt{x-1}\)+\(\sqrt{4x-4}\)-\(\sqrt{25x-25}\)+2=0

THỰC HIỆN PHÉP TÍNH 

(\(\sqrt{45}\)-\(\sqrt{20}\)+\(\sqrt{5}\)) : \(\sqrt{6}\)

31. Let’s put off that meeting to next Monday.

      A. postpone                      B. arrange                     C. start                          D. decide

32. They turned down my suggestion, which made me upset.

      A. refused                        B. agreed                      C. accepted                   D. supposed

33. I ran into my cousin, Peter, when I was on the way to school yesterday.

      A. phoned                        B. met                           C. called                       D. waved

34. Peter went through the test paper and crossed out two wrong answers.

      A. handed / chose                                                  B. dropped / discovered

      C. finished / wrote                                                 D. read carefully / deleted

35. The party kicks off at 8 o’clock.

      A. prepares                      B. cancels                     C. ends                          D. starts