: 1.If the slope of line l is 3, and point (k,5) is on the line. : Quantity A: K : Quantity B: 2 D 点斜式，点爱在哪就在哪，斜率爱多大就多大 : 2.What is the greatest prime factor of 3^100-3^97? (3^3 -1)3^97 = 26*3^97 = 2*13*(3^97) 答案：13 : 3.Companies C1 and C2 are among 18 companies, if 4 companies are selected from : all these 18 companies, how many selections of 4 companies including both C1 : and C2? (数字填空题) C16取2=120 (就从另外16家公司选两家出来陪C1跟C2) : 4.The lengths of two sides of a triangle are 5 and 12, which of following : numbers could be the length of the other side?(不定项选择题) : A. 3 B. 9 C. 10 D. 12 比(12+5)小 比(12-5)大 都可以 所以选 BCD : 5.If p=r^n，r is a prime number，and n is a positive integer，then define : p▲=rn，for example，25=5^2， then 25▲=5*2=10. what is value of 32▲? 32=2^5 答案2*5=10 : 6.A物品售出後盈利25%，B物品售出後亏了25%，最终售价都是2100，求A、B两种种物品起 : 始价格的和比4000多多少? 买进价格分别为a跟b 1.25a=2100, a=2100*0.8 0.75b=2100, b=2100*(4/3) a+b=2100*(0.8+1.333) > 4000 注意：看清楚营利跟亏钱的"基数"是不是买进价格(成本) : 7.If the standard deviation of a, b, c, d is 1, what is the standard deviation : of a+1, b+1, c+1, d+1? 资料全体一同平移==>标准差不改变 : 8.一个班级共计25人，其中A所得到的分数比班级的平均分average多6.2，经过加试後，A : 又多获得10分，其他同学成绩不变，求A的新成绩比班级的新的平均分多多少? 10/25 = 0.4 此人又多拿10分，拉高了全班平均0.4分 所以把个人成绩与班平均之间的差距又加大了10-0.4=9.6 所以此人的新成绩减去新的班平均为6.2+9.6=15.8 : 9.在一个圆内有个P点，圆的周长circumference是12。 : Quantity A: P点距离圆周最长的距离和最短距离的和 : Quantity B: 4 P点距离圆周最长距离 + P点距离圆周最短距离 = 直径 周长12，所以直径=12除以拍==>比4小 答案B : 10.What is the ratio of furniture to items in all shaded area?(其他部分也有具体 : 的百分数) 没图不解 : 11.If f(x)=x^2+2x, g(x)=x-2, what is the least value of x when f(x)=g(x)? : (数字填空题) f(x) = g(x) 求解 x^2 + 2x = x-2 ==> x^2 + x + 2 = 0 ==> 无实数解 数字又背错了吗？ : 12.What is value of r percent of s percent of 200? : A. rs/100 B. rs/50 C. rs/20 D. rs E. 50rs 看到percent就写个分母100，of就是乘，what 就是问号，BE动词就是= ? = (r/100)*(s/100)*200 ==>答案B : 13.In a certain sequence, the first term is x, and each term is -2 times than : the preceding term, what is the sum of the first five terms? 是漏字还是多字呢？ -2 times than 这个用法怪怪的耶 3 times more than <-- 这样比较合乎文法 --

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