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Cho các số thực (x,y,a,b) thỏa mãn điều kiện (x > 1,y > 1,a > 0,b > 0), (x + y = xy). Biết rằng biểu thức (P = frac{{y{a^x} + x{b^y}}}{{abxy}}) đạt giá trị nhỏ nhất (m) khi (a = {b^q}). Khẳng định nào sau đây đúng ? – Sách Toán – Học toán
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Question 37: Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. The (1) _________over vending machines in schools is not new. For a long time, regional governments and public schools have been deliberating on whether or not it is a good idea to have vending machines in schools. In America, (2) ______, only one state has banned these machines in its public schools. Around the country, however, most state schools have different rules about how many and how often vending machines should be accessible to students. Although some people believe that having these drink and snack machines in schools is a good idea, others (3)_________ that there are many disadvantages, too. Doctors and other health workers, for instance, suggest that the main disadvantage of having vending machines in schools is based on health and (4)________. They cite statistics that show school – aged children have poorly balanced diets, often due to eating too much fast food. If vending machines are introduced to schools, children will have yet another option for eating unhealthy foods. In a survey of vending machines sales across the country, it was found that sweet drinks like colas and sugary snacks like candy bars were the biggest sellers. Sugary foods and commonly drinks cause obesity in consumers. Opponents of vending machines in schools worry that we are teaching children to be obese. (5)__________the problem of childhood schools obesity, it is plausible to say that children’s health problems will only get worse if vending machines are followed in. (4)…………………….
