Các khẳng định sau đúng hay sai?
a) √3 ∈ Q b) √3 ∈ R c) 23∉ R d) −9 ∈ R.

Exercise 1: Choose the word whose underlined part is pronounced differently from that of the others

1. A. them                   B. thing                       C. then                        D. their

2. A. worth                 B. birthday                  C. although                 D. mouthful

3. A. weather              B. through                   C. think                       D. sixth

4. A. dress                   B. then                                    C. test                          D. these

5. A. close                   B. fold                         C. cloth                       D. hold

6. A. woman               B. man                                    C. badminton              D. relax

7. A. cousin                 B. mouse                     C. round                      D. mountain

8. A. boat                    B. broad                      C. coast                       D. soap

9. A. travel                  B. marathon                C. match                     D. class

10. A. fair                   B. chair                       C. marry                      D. hair

9:A

10:B

7: chiều cao là :60 : 6 = 10

6D

7B

8C

C            2 thành -2                 -1 thành 1                0 giữ nguyên