17. 我的第三题,六张纸牌,编号1到6,随机抽出一张,再放回,再抽出一张,两次加在一起为8的情况下,其中一张编号为5的概率?
作者答案及思路:3、5, 5、3,4、4,4、4,2、6,6、2 其实应该是5种情况,2次4,4其实都是一样的,不能算成2次,所以此题答案为2/5。
18. 三个数算术平均数为39,Median是48。求最小数的最大值。
作者答案及思路:我的答案是21。
19. 想起那道唯一的老机井了:6个队每队出三个代表,互相握手但同队的人不握手,一共要握几次手?
作者答案及思路:
remeo评价意见:应该是C-6C=135
20. 一个三角形,求周长
是等腰
已知某两边长的和为20
答案:E
21.A company can produce item A with no more than 800 per day and item B no more than 400 per day. If the company can see product A $10 profit each and sell product B $4 profit each. The company can sell no more than 1000 items each day. Which is the following can make the company have the maximum profit per day.
1. 900 A, and 100 B
2. 800 A, and 200 B
3. 700 A, and 300 B
4. 600 A, and 400 B
5. 500 A, and 500 B
答案:2
22.问点在第几象限?
1。x+y0
2。|x|-|y|0
23.大正方形内一个小正方形,对角线重合,为1:3。求面积比
24.m除以9的余数是多少?
1。m除以27余3
2。m除以3余1
25.5份水和5份antifreezer制成混合物,取出3份混合物,再放入3份antifreezer,求新的浓度
26.f=2^x3^y5^z.。 x,y,z分别表示一个数的个位、十位、百位。f=9f.问f比f大多少。
27.一个人的月工资和他销售量的关系。卖10个以内,收入$200,10到20个之间,收入100+10销售量,销售大于200,收入20销售量。问这个月收入多少。
1。这个月比上个月多卖2个
2。这个月比上个月多赚$10
28.If n is an integer and 2 6, what is the value of n?
n is a factor of 15.
n is a factor of 21.
29. Each of the 45 boxes on shelf J weighs less than each of the 44 boxes on shelf K. What is the median weight of the 89 boxes on these shelves?
The heaviest box on shelf J weighs 15 pounds.
The lightest box on shelf K weighs 20 pounds.
30.S 是n分之一的和, 101=150 求s的范围
选择有0到3/1, 1/3-1/2, 1/2-2/3,2/3-1, 1-3/2
31. 比n小或者等于的数得和可以表示为n/2,求小于等于714得数中是6得倍数的和。
答案应该是3119120
32.-=r, 求y得值
选项1:r^2=25
选项2:r=5
33.还有一题几何题,一个正方形边长为100米,上面有一个直角三角形直角边为60,80米, 合起来是一块田地, 一带化肥能用于2000平方米, 求需要多少袋化肥,我算出来好像是7
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