Tìm số nguyên a,b biết : a>0 và a.(b-2)=3

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Exercise 1: Give the correct form of the verbs in brackets. 1. If I see him, I (give) …………………….. him a gift 2. If I had a typewriter, I (type) ………………………….. it myself. 3. If I had known that you were in hospital, I (visit) ………………………………… you. 4. He could get a job easily if he (have) …………………………a degree 5. If he (study) …………………… hard, he can pass the exam. 6. If I (know) ………………………………… his telephone number, I’d give it to you 7. If I (try) ………………………………… again, I think that I would have succeeded. 8. If she (not hurry) ………………………. she may be late. 9. I_________ (offer) to give you a lift if I had my car here. 10. If I lend you £10 when you (repay) ……………………………… me? 11. We’ll have to move upstairs if the river (rise) …………………… any higher. 12. If he (work) ……………………… hard today, can he have a holiday tomorrow? 13. If you (not like) …………………………… this one, I’ll bring you another. 14. Unless you are more careful, you (have) ……………………… an accident. 15. Tell him to ring me up if you (see) ………………………………… him. 17. He (not/ feel) …………………very tired today if he (not/ play) …………… rugby yesterday. 19. If I tell you a secret, you (promise) ………………………………. not to tell it to anyone else? 20. If he (like) ……………………………… the house, will he buy it? 42. If it (snow)_________ in our country in winter, we would go skiing. 43. If Lan _________(be) here today, she would enjoy herself. 44. If I had had any money, I (lend) _________you some. 45. __________(you/mind) if I _________(not give) you the money I owe you today? 46. If I _________(get) home late, my parents will be very worried. 47. His grades at school won’t improve unless he _________(stop) playing. 48. I will cut the grass this Saturday if it _________(not rain) 49. If he _________(not give ) me a lift, I’d have been late for the interview. 50. If I were you, I. _________ (not wait), I_________ (go) now.