Chứng minh bất đẳng thức sau : ( Xin cm chi tiết và giải thích kèm theo - có thể viết tay gởi hình bài giải )

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trọng âm Exercise 21 1. A. resources B. increase C. farmland D. disaster 2. A. iron B. metal C. forest D. dessert 3. A. technological B. population C. communication D. information 4. A. hostility B. microchip C. equality D. destruction 5. A. humble B. concern C. orphan D. terrible 6. A. adequate B. reveal C. construction D. together 7. A. experience B. discomfort C. support D. friendship 8. A. numerous B. admit C. occasion D. attempt 9. A. immediate B. success C. eagerness D. phonetic 10. A. conference B. horrible C. experience D. language Exercise 22 1. A. result B. strengthen C. forget D. abolish 2. A. suggest B. relate C. empty D. effect 3. A. colleague B. available C. different D. sacrifice 4. A. discovery B. researcher C. remain D. label 5. A. identify B. continue C. popular D. consumer 6. A. product B. satisfy C. mistake D. however 7. A. approval B. novel C. compulsory D. illusion 8. A. inversion B. miserable C. pleasant D. difficulty 9. A. establish B. rely C. project D. require 10. A. organize B. embarrass C. discourage D. surrounding Exercise 23 1. A. chemical B. accumulate C. opinion D. available 2. A. computer B. machine C. instant D. appliance 3. A. eventual B. electricity C. popularity D. volunteer 4. A. deliver B. avoid C. manage D. advise 5. A. cooperate B. enough C. discuss D. saturate 6. A. alternative B. energy C. process D. temperature 7. A. potential B. possess C. survival D. current 8. A. burglary B. employment C. courageous D. dependent 9. A. comment B. nourish C. marine D. landscape 10. A. obstacle B. government C. courage D. dismiss Exercise 24 1. A. opportunity B. decoration C. temperament D. expectation 2. A. particular B. equipment C. identify D. miracle 3. A. complete B. command C. common D. community 4. A. journal B. mourning C. calcium D. although 5. A. memory B. compare C. connect D. upgrade 6. A. stimulate B. permanent C. fertilizer D. variety 7. A. accelerate B. digestive C. disorder D. infantry 8. A. convenient B. previous C. management D. purchase 9. A. deliberate B. dramatist C. discovery D. improvement 10. A. redundancy B. comparison C. maintenance D. capacity Exercise 25 1. A. interview B. essential C. industry D. comfortable 2. A. confirm B. convenient C. tranquility D. awkward 3. A. industrial B. destruction C. extreme D. energy 4. A. behaviour B. requiremenht C. abundant D. estimate 5. A. historical B. general C. obvious D. mordernize 6. A. continent B. permission C. circumstance D. interest 7. A. recycle B. completely C. introduce D. alternative 8. A. religious B. miserable C. perform D. include 9. A. significant B. quantity C. committee D. believable 10. A. ambitious B. constant C. investment D. exhaust