数学: 1 X三次方减X 那题,看图的,以前JJ有 2 A total of 30 percent of the geese included in a certain migration study were male. If some of the geese migrated during the study and 20 percent of the migrating geese were male, what was the ratio of the migration rate for the male geese to the migration rate for the female geese? [Migration rate for geese of a certain sex = (number of geese of that sex migrating) / (total number of geese of that sex)] A. 1/4 B. 7/12 C. 2/3 D. 7/8 E. 8/7 Answer: B 3 有7个人,其中6个人的年龄是31,22,37,28,35,25,问第7个人的年龄? (1)range是17 (2)median是28 选 C 4。0 到500 的数中,被7除余1,被三除余2 的数有几个 5。给出一条直线的方程,问另一条直线和他平行不? a 给出了另一条直线的方程 b 给出了另一条直线的斜率 答案,D 两个都行。 6。 一辆车旅行,出发回来走两条路,出发的路每加仑油走20英里,回来25,问平均耗油?1)共走了175 2)回来路程是出发的四分之三 答案B 7。 前五个质数的和共有几个factor(包括1和它本身)?(6个~~) 8。5^15*6^18-5^16-6^15 答案:30^15 9. four brothers, A, B, C, D, who is the oldest? 1. A's age is the average of B & C. 2. D's age equals the sum of B and C subtracts A Ans: E, cannot determine 10.一个集合,只要x在这个集合里,-x就在这个集合里,如果x跟y在集合里, 那xy也在集合里,问12在不在集合里 1)2在集合里 2)3在集合里
选 C 11。A做一份工作的时间是B 的3/4,A和B合作要6小时,问B单独做要多少时间.14 12.x/y>1? a.xy>0 b.y<0 选 E 13.在xy plant上, A(3,2) B (3,6) C (11,8) D(11,X),ABCD是平形四邊形,問X? 选X 是12 的那个 14。9-x^2>0,x^2-2x-8>0,x must be 在哪个范围内? 答案:(-3,-2) 15。一个数列,an=an-2+11,问633是否在数列内? (1)a1=39 (2)a2=43 答案:A 16。以下哪个方程在xy-coordinate中的图中只有一个点both coordinates是整数? y=7/15x,y=x+1/2,y=x乘以根号3 ,还有两个显而易见是会有无数个整数坐标的 答案:y=x乘以根号3 17。N不等于N^2,问X 是不是在N和N^2的中间 a.X>N b.X<N(N+1)/2 答案 B 18。G(x) 是最大的比x小或等于x的integer;L(x)是最小的比x大或等于x的integer。求L(x)-G(x)的集合? (jj作者想说G(x)是小于等于x的最大整数;L(x)是大于等于x的最小整数) 选项:{0},{1},{0,-1},{0,1},{1,-1} 答案:选{0,1} 19。Someone purchased 5 Oak doors and 6 pine doors. Oak doors cost twice as much as pine doors at regular price, but was sold at a discount of 25%. If Pine doors are $40 each, how much was the total amount for these 11 doors. Ans: $540 20。订报纸,订A的人中1/5订了B,订B的人中1/4订了A,问所有人中多少人订了B 答案:1/2
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