1.is x+y is negative? (1) x is negative (2) y is negative ans:E 2.if n is a positive integer and the product of all the integers from 1 to n, inclusive, is a multiple of 990, what is the least possible value of n? Ans:11 3.if 2^x-2^(x-2)=3(2^13), what is the value of x? Ans:15 4.if v ans w are different integers, does v=0? (1) vw=v^2 (2) w=2 5. if xy>0? (1) x-y > -2 (2) x- 2y<-6 6. if x and y are integers and x>0, is y >0? (1) 7x-2y >0 (2) - y< x 7. are xa and y both positive? (1) 2x-2y=1 (2) x/y > 1 8. if two sides of a trianglle have lengths 2 and 5, which of the following could be the perimeter of the triangle? (一) 9 (二)15 (三)19 ans : none! 阿!!!一次有好多问题! 我对数字比较大小的问题非常不会! 是不是每次都一定要带数字阿? 我实在头痛了我! 请大家帮我看看这几道!大概都是prep的!然後我有搜寻过伤咖但是它没有的! btw, 为啥我无法搜寻cd, 不是按搜寻进去,写出重要字即可吗?可是我每次都无法找到耶! 怪了! 谢谢大家! --

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