打针回来[转帖]

smart

打针回来， 手还在疼， 但怕忘了题， 还是写下来先

Ai: job security and salary should base on performance instead of years of service
Aa: depot disc advertise with radio, therefore Carlo’s clothing store should adopt the same method, shifting the advertisement on newpapers to radio.

Math:
1)Mprtz>0,which of the following must be positive?
I mp>0
II rt>0
III tz>0
---------- the last question

2)eat pie?? Tracy ate 1/2, the other ate the 1/4 of the remaining, ask what faction of the pie is left?

3) one very strange: DS:
can determine x*x+y*y ?
1) 2x + 3y= 6
2) x/3+ y/2=1
-----------two conditions are the same, sure, I double checked them E

3) simple annual interest:
one investment ‘s interest rate is x, other investiment is $5000(not sure ), interest rate is y
ask what is the first investment ? making the interest on these two investment to be same at the end of the year.
1) the interest at the end of the year is$….(a number)
2) y=2x  (or x=2y)


4)one buy n things at a total cost of t, and sell out they at the price for pre stuff is $d, if he will buy
and sell 100 this kind of thing at $d, ask the profit he will get?


5)1, 11,111,…. Ask what is the tenth digit of the sum of first 40 number in this sequences?

6) sequence I: a1, a2,….. a10
sequence  II: r1,r2,……r10
ri is the remain of the ai divided by 2, what is the sum of sequence II
1) there are six numbers in sequence II
2) the sum of sequence I

7)a teacher teached 3 classes A,B,C, the average score is 65,80,77. the ratio of number in the class A,B,C is 4: 6:5, ask the average…(not sure if the particular number is right, I get 75)

8)xy+z=1
xyz=3/16
x+y=1
ask what is the value of squarte root of 1/x+1/y+1/z-3/16
(逐个通分，代入条件)

9)a word is made of 3 characters: the second is made of one of vowel number (a,e,I,o,u); the first and third are different, and made of unvowel numbers
ask what is the total possible number?(2100)

10)x=5^y, x=(1/5)*x*y^2
ask what is 625

11)1 red stuff, 3 green stuffs, choose 2 of them randomly, ask what is the probrability of choose both of 2 are green?

12)one get salary in the following way: 500 + (x thousand – 5000)*10%, ask the express of the salary in terms of x

13)xy=1,
x=2^(-5)*5^3
ask what is y?

14)cotton and soybean:
total sales of them are …; price of cotton is 80; cost of soybean is 40
ask what is amount of cotton?
1) the total amount of cotton and soybean is …
2) the ratio of them are…(not sure)
------anyway, the answer is D

15)In a circle, the radium is 2, the angle of the triangle is 120 degree, ask what is the area of the triangle in this circle
------squarte root of 3

16)one 四边型, one angle is 50 degree, others are expressed as k,x,y
ask what is y?
------- can not describe it in detials, but you can figure out it when you see it. The answer is 65 degree

17)the area or rectangle is 80
what is the perimeter?
1) the long one is 2 more than the short one
2) the length of the longer one is 10

18)
In a order, the shipment fee is $3, the price is $19.95
ask the exact number of the things in the order?
1) total cose is between 210 and 225
2) total cost is between 190 and 215
-------I get B, not sure whether I remember the right numberof the range of the total cost

19)the most difficult question in my test:
survery of 800 students to two things’s attitude---- M and R
the response can be YES, NO, Not sure

the table in the question tells us that:
to M: 500 Yes;200 No; 100 not sure
to R: 400 Yes;300 No; 100 not sure
200 only reply Yes to M ;
ask what is the number of student who do not reply either Yes ?
------------ I get 200

20) the other difficulty:
if each patron will borrow from 1 book to 10 books from the library,
the total number of the books borrowed from the library is 1600
ask if the number is greater than 300?
1) 150 patrons brrow 3or 4books
2) there are 80 patrons borrow 1or 2 ; 150 patrons borrow 3 or 4(not sure of the particular number)
-----------I get 2), I use the maximal possible number.