3:4 = tam : tứ = tám : tư = 8:4=2

Bài tập về các thì

1. I (learn) English for seven years now.

2. But last year I (not/ work) hard enough for English, that's why my marks (not/ be) really that good then.

3. As I (pass/ want) my English exam successfully next year, I (study) harder this term.

4. During my last summer holidays, my parents (send) me on a language course to London.

5. It (be) great and I (think) I (learn) a lot.

6. Before I (go) to London, I (not/ enjoy) learning English.

7. But while I (do) the language course, I (meet) lots of young people from all over the world.

8. There I (notice) how important it (be) to speak foreign languages nowadays.

9. Now I (have) much more fun learning English than I (have) before the course.

10. At the moment I (revise) English grammar.

11. And I (begin/ already) to read the texts in my English textbooks again.

12. I (think) I (do) one unit every week.

13. My exam (be) on 15 May, so there (not/ be) any time to be lost.

14. If I (pass) my exams successfully, I (start) an apprenticeship in September.

15. And after my apprenticeship, maybe I (go) back to London to work there for a while.

16. As you (see/ can), I (become) a real London fan already.

Áp dụng tính chất các phép tính nhanh để tính nhanh

a) (-2,5. 0,38. 0, 4) - ( 0,125. 3,15. (-8))

b) ((-20,83) .0,2 + (-9,17).0,2) : ( 2,47.0,5 - (-3,53).0,5)

Dựa vào tính chất " Nếu x < y và y< z thì x< z" hãy so sánh

a) và 1,1

b) -500 và 0,001

c) và