628. (79/161)*(sqrt(22)-sqrt(18))^2 is closest to? 0,2,4,6,8 0,参看以前JJ ---------------------------------------------------- 629. In the xy-plane, line segment from point (2,2) to point (6, 5) is the diagonal of a square. What is the area of the square? 25/2 对角线长5,边长为5/根号2 ---------------------------------------------------- 630. Tossing two dice, what is the probability of getting a five as the sum of the two dice? 1/9 。 2*2/(6*6) ---------------------------------------------------- 631. What is the range of five positive integers 0, 5, 9, x and y? 1). x+y=9 2). X-y=1 A X,Y都在0-9的范围内,所以range就是在0-9之间 ---------------------------------------------------- 632. In 2000, 12.6% of the revenues of company A were from product X. If the amount of the revenue on X was 7.2 million, what was the amount of the revenue from none-X products? 50 见614题。 ---------------------------------------------------- 633. If (1/8)^n=(1/2)^6, n=? 2 ---------------------------------------------------- 634. The number of chicken hamburgers, fruit hamburgers and fish hamburgers are in the ratio of 7 to 5 to 2. If there are more than 5 fish hamburgers, how many chicken hamburgers are there? 1). There are less than 25 fruit hamburgers. 2). There are less than 25 chicken hamburgers. 类似590题。B ---------------------------------------------------- 635. Of the 500 temperature records, 76% are less than or equal to 153 degree. What is the median of the 500 records? 1). Of the records greater than 100, 60% are less than of equal to 153. 2). Of the records greater than 100, 40% are greater than 153. D 与463题相同 ---------------------------------------------------- 636. If (7^(-2)*7^6)/7^4=7^x, x=? 0 ,7的0次等于1 ---------------------------------------------------- 637. A farmer is dividing her eggs in groups. When she put the eggs in groups of two, three, four, five, and six, there was one egg left over, but when she put them in groups of seven, they ended up in complete groups with no eggs left over. What is the least possible number of the eggs? Answer: 301 The common multiples of 2, 3, 4,5 and 6 are 60, 120, 180, 240, 300, 360, ... So, the number of the eggs: n=60a+1. Then, a=? We find that when a=5, n=301, it is the least number that can be divisible by 7. ---------------------------------------------------- 638. If the sum of six consecutive numbers after t is n, what is the sum of six consecutive numbers after t+6? Ref Ans. n+36 t+6后的六个数每个都比前面六个数中对应的数多6 ---------------------------------------------------- 639. What is the remainder of 7^381 divided by 5? Ref Ans. 2 ---------------------------------------------------- 640. If S is a set of 12 integers, is the sum of the numbers less than -3? 1) The numbers in the set are consecutive numbers. 2) There are more negative numbers than positive numbers. Ref Ans. C ---------------------------------------------------- 641. Which of the following represents the largest of 3 consecutive numbers whose sum is a multiple of 10 5, 41, 30, 42, 8 Ref Ans. 41 一定是尾数是0的数和它左右的两个数的和尾数才为0 ---------------------------------------------------- 642. x<>0. Is x^3 = 1? 1) x^2 = |x| 2) x < 0 Ref Ans. B ---------------------------------------------------- 643. J抯 share VS A抯 share is 5:3. If J抯 share exceeded 5/9 of the total sum of money, how much is A?share? A 180$, B 270$, C 360$, D 450$, E 540$ 前面有这道题,但我还是觉得题目少个数据。 ---------------------------------------------------- 644. nx>ny? (Could be n^x > n^y?) (1) n^2*x>n^2*y (2) x>y Ref Ans E。 因为n 的正负号不确定。 ---------------------------------------------------- 645. (9999.7) * (102000.2) + (1000.3) is the closer to the value of 10 raised to the power of? Ref Ans. 9th power. ---------------------------------------------------- 646. The children Totally denoted 28 clothes to an institution. If the range of the numbers of the clothes denoted by each child is 2, how many children denoted exactly 3 clothes I:0 II:5 III:9 原作者: Ans. I and III 。我对这个题还是有点疑虑。我总感觉I、II 、III 都对 ---------------------------------------------------- 647. 如果 AB 的积 > 0, 问 Ax+By = 5 这条直线的特性, 答案有斜率是无限大, 与 X/Y 轴的交点大于还是小于 0, Y =-A/BX+5/B。故斜率为负 ---------------------------------------------------- 648. 81/159 * (开更号22-开更号18)^2 这个题应该是0,大概为1/2*[40-2√(20*20)] ---------------------------------------------------- 649. 1/x(开更号2x+开更号x) = ? 大概是这类的题目 要先上下各平方以后再上下乘 (开更号2x-开更号1)这类的数化减 最后答案是 (开更号2x-1) / 开更号x 的样子 ....总之这是一个难题 ---------------------------------------------------- 650. 2^(8x+6)-y 是偶数吗(还是奇数?) 1) x=1 2) y=1
选C。我忽略了一个问题,题目中没有说X是integer 选C。我忽略了一个问题,题目中没有说X是integer ---------------------------------------------------- 651. A 是 1-300 的每个数的和, B 是 -5到 -300 的每个数的和 求 A+B -> 选 10 。应该为1、2、3、4的和 (CD 上面的 10 月机经第 131 号的变形) ---------------------------------------------------- 652. 利息题 单利 问能不能得出利息是几 %, A B 两个条件都是几块钱的投资一年收了多少利息 有点怪 这个题好像是以前JJ的变题,选D,直接用单利公式算就可以了 ---------------------------------------------------- 653. 有 W 个人, 且 W 除以三余 1, 这些人分三组, 每个人都得被分组, 则三组人的人数表示为: (w-1)/3 (w-1)/3 (w+2)/3 ---------------------------------------------------- 654. 长方形, 两边为 5 跟 12 求对角线(这个字最难)长度: 13 。 5^2+12^2=13^2 ---------------------------------------------------- 655. A 跟 B 分某公司的营利 比例是 5:4, A 的盈余比全部盈余的 5/9 还多 50....数字可能不大正确 A: 5/9X+50, B:4/9X+40 ---------------------------------------------------- 656. 一堆球, 三种球的比例是 4:2:3, 问第一种球有几个 1)第一种球比另两种球加起来还少五个 2)第二跟第三种球加起来 50 个 ....数字也是乱编的 D ---------------------------------------------------- 657. asking which one of the following is the least in value when converted into its recipical. a b c d e |-----|-----|-----|-----| -2 -1 0 1 2 这个题我没有看错吧?是求倒数的么? 那么-1的倒数还是-1,是最小的
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