1. different

2. depth

3. famous

4. helpful / help

5. shopping

6. school

7. office man

8. color

Today he has a very bad pain in his chest

Ta có 5 x a + (1+2+3+4+5) = 65

5 x a = 65 - 15 

5 x a =  50  Vậy a  = 50 : 5 nên a = 10 . Giải theo toán Tiểu học 

1. will lose / don't exercise

2. don't take / will miss

3. will visit / send