tìm x thuộc Z: a) |x+1|+|x-4|+|x+2|=4x-16 b) |x-1|+|x-2|+|x-3|=4x-12 c) |x+2|+|x+3|=x

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EXTRA EXERCISES I. Give the correct form of the verbs: 1. When Hoa arrived at the theater, the film ____________(start). 2. He ____________ (live) in Laos before he went to Vietnam. 3. After Lan ____________ (eat) the cake, Lan began to feel sick. 4. If he ____________ (listen) to me, he would have got the job. 5. Linh didn’t arrive until I ____________ (leave). 6. After they ____________ (finish) lunch, they went out. 7. The tree was dead because it ____________ (be) arid all summer. 8. I ____________ (meet) him somewhere before. 9. They were late for the flight because they ___ (forget) their passports. 10. Linh told me she ____________ (study) a lot before the exam. 11. The leaf was yellow because it ____________ (not/rain) all summer. 12. The lamp went off because I _________ (not/pay) the electricity bill. 13. Hoa____________ (not/do) her homework, so she was in trouble. 14. She ____________ (not/eat) so we went to a restaurant. 15. I couldn’t go into the cinema because I ____________ (not/bring) my tickets. II. Write sentences in the passive form, using the suggested words 1. Our car / service / a mechanic / tomorrow morning. - ……………………………………………………………………… 2. At the surgery yesterday, I / examine/ Dr. Peterson / and I / give / prescription. - ……………………………………………………………………… 3. It looked like the window /break / a hammer / some time before. - ……………………………………………………………………… 4. I went to see it because I / tell / it was a good film / all my friends. - ……………………………………………………………………… 5. Your cheque / send / last Friday and / should / deliver / to you tomorrow. - ………………………………………………………………………