63. For which of the following functions is f(a + b) = f(a) + f(b) for all positive numbers a and b ? (A) f(x) = x^2 (B) f(x) = x + 1 (C) f(x) = 根号2 (D) f(x) = 2/x (E) f(x) = -3x 答案E 这种类的题目要怎麽解呢@@~~ 64. Are at least 10 percent of the people in Country X who are 65 years old or older employed? (1) In Country X, 11.3 percent of the population is 65 years old or older. (2) In Country X, of the population 65 years old or older, 20 percent of the men and 10 percent of the women are employed. 答案B 180. Are x and y both positive? (1)2X-2Y=1 (2)X/Y>1 答案C 192. Of the 75 houses in a certain community, 48 have a patio. How many of the houses in the community have a swimming pool? (1) 38 of the houses in the community have a patio but do not have a swimming pool. (2) The number of houses in the community that have a patio and a swimming pool is equal to the number of houses in the community that have neither a swimming pool nor a patio. 答案B 我选C 囧> 要怎麽只看第二个选项推得呢?? 198. Did one of the 3 members of a certain team sell at least 2 raffle tickets yesterday? (1) The 3 members sold a total of 6 raffle tickets yesterday. (2) No 2 of the members sold the same number of raffle tickets yesterday. 答案D 恩恩 不太懂第二个选项@@~~ 麻烦好心人解答 感恩^^ --

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