18. catchuan 11/14 北京 AWA/MATH 11.14一点JJ http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=206967&page=2 283.有32所学校办了什么实验班,每所学校两个班,一共请了37位老师。这37位老师每人至少要带一个班,最多带三个班。问这样的话,同时带了三个班的老师,其数量有可能的最大值和最小值。 选项A.0 and 13, B.0 and 14 C. 1 and 10...... 当时选了B,后来一想,应该是A :( 解:A 64个班,37个老师。a 为带一个班的,b为带两个班的,c为带三个班的 即a + b + c = 37 a + 2*b + 3*c= 64 a - c = 10 则 c 最小为 0 当 c = 14时,a = 24 a+ C>37不成立。所以选A 感谢顾风的解答!!! 284.还遇到了好几道求近似值的题,比如9^9-9^2的近似值是:
A.9^9 B.9^8 C.9^7.....这样类似的题在不同时间出现了三次,我晕~ 解:A 待讨论 285.一个工厂总的生产成本分布如一个饼图所示(饼图里各部分的成本为40,000; 20,000; 20,000;10,000;10,000)。说他们的产品经理决定把各部分的成本都提出p percent来,组成一个新产品的成本X,问P的表达式(用X表达)
我做的结果就是X*10^(-5) (现在超级困,题目大致是这样,如果有什么数字上的问题,大家看看思路就好,抱歉) 解:待补充 19. unclekin 11/13 广州 730 AWA/MATH/RC/CR 11.13 广州一战用jj感谢cd http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=206691&page=2 286.9^8-9^2与哪个最接近?几个选项大致是9^8 9^10 9^13 9^6 9^11 解:A 287.以下哪个与r,s,t的标准差一样 i)r-2,s-2,t-2 ii)0,r-s,t-s iii)t-1,r+5,s-4 解:1和2 本月JJ 288.去年年初存入40000元 年利率是r% 每季度最后一日计息一次 问r=? 1)今年1月1日的利息收入小于a(确定值具体是多少记不得了) 2)去年4月1日的帐户余额为1200元 解:B 待讨论 289.3J6和6KM是两个三位数,他们的和等于N0J3(一个四位数) 求K的值 解:9 290.有a,b两件事 做a的人是做b的人的2倍 只做b的人是ab都做的人的1/2 ab都做的人有2500 问只做a有多少人 解:5000 类似本月JJ 291.0<a<10 求a 1)三位数2a3可以被3整除 2)三位数6a9可以被9整除 解:B A=3 292.8^2*6^7/3^7(劲弱智,看到这个题就知道前面一个题错了,可惜记不起来) 解:2^13 20. betterday 11/14 北京 730 AWA/MATH/RC 11/14 BJ 730 一战 http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=206844&page=2 293.remainder of 2^k divide by 10 1) k can be divided by 10, 2) k can be divided by 4; 我选B, 余6 解:B 本月JJ 294. 两条直线k&l, k的斜率<l ? 1) k在x轴的截距>0; l在x轴的截距<0; 2) k&l相交于y轴的正数部分 my chice: C 解:C 本月JJ 295. 不知道怎么贴图。有一矩形UVWX, UX=10. 矩形中以UX为底边有一三角形UQX, 问 Q到UV的距离? 1)area of uvwx is 80 2)area of QUX is 60 my choice: E 解:E 本月JJ 296.还有一道题记不太清了2a6+一三位数=*b9, 问a\b的值;1)2a6可被3整除 2)*b9可被9整除 (具体数字记不清了)答案sure:c 其他的题记不清了,不写出来干扰大家了,都不难。 解:B 本月JJ 21. Flyingfar 11/15 上海 710 AWA/SC/CR/RC/MATH 11.15上海晚场JJ http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=207202&page=1 297. Club A and B. 30% of club A belongs to Club B. Does Club A has more members than B? 1) Club A has 60 members. 2) 40% of club B belongs to club A. 解:B 本月JJ 298. The price of a certain stock is x$ per share. This is increased by r% and then again increased by y$ what is the ratio of the increased price to the original price? The tricky part about this one is the answer asks you to get rid of % after r. I actually don’t know how to do it. 解:(xr%+y)/x 类似于本月JJ 299. At beginning of last year, Mary deposited a portion of her 10,000 at a simple annual interest of 10% and the rest at 6%. How much did Mary deposit in 10% last year? 1) The total interest is 680. 2) The interest Mary made from 10% is 2.4 times what she made from 6%. 解:D 300. I got this one too. 51.m,p, s and v are positive integers. m/p < s/v, which of the following must be between m/p and s/v? I. (m+s)/(p+v) II. ms/pv III. s/v-m/p 解:1 本月JJ 301. what is the unit digit of (537) ^20? 解:1 本月JJ 302. If r is a positive integer, then S is a n-digit number. S=5^r * 2^(r+6). What is n in terms of r? a. r+2 b. r+3 c. r+6 d. 2r+6 I have no clue about this one. 解:A 题目的意思是S是n位数,如n=2,s就是2位数, S=5^r * 2^(r+6) --> S=(5^r)*(2^r)*(2^6) = (10^r)*64; so n=r+2 感谢晴天小狗的提醒!
303. A set of number which satisfy the equation Sn=4/n-4/(n+1). What is the sum of the first 100? The answer shall be 400/101. 解:400/101. 不要把给出的Sn当作sum,看成是An
so the sum of the first 100 = 4-4/2+4/2-4/3+4/3-4/4+......+4/99-4/100+4/100-4/101 =4-4/101=400/101 感谢晴天小狗的提醒!
[此贴子已经被作者于2006-11-19 17:17:52编辑过] |