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P=(a^4 +b^4+c^4) -2a^2b^2 - 2b^2c^2-2a^2c^2 a) phân tích P thành 4 nhân tử b)CMR P<0 nếu a,b,c là 1 bất dẳng thức tam giác
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VI. Choose and underline the correct words or phrases in the brackets: 1.He is a famous stamp …………………………. A. Collect B.collection C.collector D.collective 2.The restaurant has the______for serving some pof the finest food. A. repute B. reputed C. reputation D. reputable 3. My village is about 120 kilometers ………….the west of HCMC. A.in B.at C.to D.for 4. Let’s …………..somewhere for a drink. A.go B. do C. going D.doing 5. She sings very …………………… A.beauty B. beautiful C. beautify D.beautifully 6. He used to ……………..full time, but now he is a part-time worker. A.work B. working C.worked D. to work 7. I wish you ……………..us someday. A.visit B.will visit C. visited D. would visit 8. They often go to that ………….to pray. A. market B. hotel C. hostel D. shrine 9. Getting to the village is a very interesting ……………… A. walk B. journey C. shopping D. fishing 10. There is a meeting …………..9AM and 2PM. A.on B. between C. till D. at 11. We are looking forward to______you. A. see B. seeing C. look D. looking 12. It’s very kind______you______say so! A. with/ to B. to/ to C/ of/to D. From/ to

Fill in the blanks with words given by overtaxed even food parts systems troubles off occurred plan Foremost among Vietnam’s agricultural (1)……..was exceptionally adverse weather, including a drought in 1977 and major typhoons and widespread flooding in 1978. The drought (2)……Vietnam’s modest irrigation (3)…………., and the floods damaged them. In addition, the floods reportedly reduced cattle herds (4)……..20%. The size of this loss was indirectly confirmed in Vietnamese statistics that showed a leveling (5)…….of growth in livestock inventories (particularly of cattle) between 1978 and 1980. Throughout the Second Five-year (6)…….., and especially in the late 1970s, chemical fertilizers, pesticides and spare (7)……….for mechanical equipment were in short supply. Despite their troubles having (8)………., for the most part, fairly early in the plan period, the severe reversals in agricultural sector greatly diminished hopes of achieving self-sufficiency in (9)………….production by 1980. the 1980 grain target eventually was lowered from 21 million tons to 15 million tons, but (10)……..that amount proved unattainable.

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