700+ 今天杀机成功 我要感谢****的数学JJ,我在考前看了300多道JJ,最后列出我碰到的相同或相似的题目,真不少,不过我记忆力不好,所以回忆不起什么,请大家见谅!
81、n is a positive integer. Is n divisible by 3?
1) when n-1 is divided by 3, the remainder is 2 (or something like that)
2) neither n+1 nor n+2 are divisible by 3
87、50% of Male employees are more than 35 years old; 40% of Female employees are more than 35 years old. 45% of total employees are more than 35 years old. What fraction of total employees are females? (cannot remember the exact numbers, but the answer is 4/5)
89、What is the value of (1.00001*0.99999) - (1.00002*0.99998)? (it could be plus, I forgot), but the key is to change it to (1+10^-5)( (1-10^-5) - (1+ 2*10^-5)( (1- 2*10^-5).
117、四边形 (1) ab=bc=cd=da, (2) <bad + <adb =180 I chose "E"
141、问一个club中女会员年龄小于30岁的会不会占所有会员的1/10?
(1)有多余60个女会员年龄在50岁以下,这当中多余1/2年龄在30岁以下。
(2)1/20男会员年龄在30岁以下。
152、360人,75%有a,60%有b,兩者都沒有佔15%,問有a沒有b的人數
156、一包什么东西里面有24片长方形的纸之类的,尺寸15*10。贴于尺寸45*20的什么鬼东西上,要用掉多少百分比那包东西?
应该是6片,所以是1/6。
160、电话号码7码,第1码由2-9任选,其余6码0-9选,可重复选,请问有多少种组合?我选8(106)
187、A比Y少40%,B比A少40%,Z比Y少40%,问Z大于B多少百分比,
200、总共12个球﹙或是什么东东﹚,5个蓝色,4个黄色,3个红色,1个绿色
问拿5个球,拿了不放回去,前面5个都是蓝色的机率
201、X公司卖A产品和B产品,A产品总共卖了x个,每个的利润是40,B产品总共卖了y个,每个的利润是20,问A产品卖多少个
1)2x+y=200 2)X公司卖这两个产品的获利是4000
爱维的天:﹙E﹚ 这题有陷阱,因为两个条件结果都一样,所以无法求出x
307、有26人,要么学paiting,要么学music。学p的人有10个,学m的20个,问从m中随机选取一个,学p的概率多少?
answer:20%
351、5 something , randomly pick from them, ask the possibilities that one of them appears before another.
回忆起的三道:
池子里有X多水,用什么DD住满要R小时,用R+5的的速度要用多少小时?
还有道比谁离原点近的,什么-1/2,-2/3,4/5,还有两个比较复杂的,换算一下就知道了
average of gourp numbers x greater than that of group y, the standard deviation of x is greater than Y?
a> 10 numbers in each group
b> the range of both group is the same |