cook

well done  for 十月机经（四）and 十月机经（五）

cook

2. 某人买了more than 10 P books和一些H book,P book 每本$8,H book每本$25,问,买H book一共花了多少钱 1)买H book花的钱at least $150 2)总共花了less than $260 (注意! less than $260,关键) P books至少20本,所以只可能是 20 P books, 2 H books, 如果有4 H books,那总金额就达到$260了,题目是less than $260. 选C 数学好像就这么两题需要注意一下的 ------------------------------------------------ C 但我的算法与leftsky, tonxun 的有些不同： 由两条件可得，H book 的钱: 150

cook

11.DS判断(X,Y)的象限
1)X+Y>0
2)|X|>|Y|
--------------------------------
E -----> Thought it should be C.
===================



[em13]

cook

yes, X>Y>0 or X>-Y ( x>0, Y<0)

cook

Please double check the following questions, thanks!

1.DS有图。
说三角形ABC（逆时针）AB与X轴平行BC与Y轴平行。求B点横坐标。
1.A(-1,2)
2.C(8,10)
答案：B *************---> C
9.A,B两公司卖馒头，98年A公司比B公司卖的馒头多，99年和00年A，B两公司分别比本公司前一年多卖了3%的馒头，问A，B两公司在00年卖的馒头差比他们在98年卖的馒头差增长了多少？
答案：6.09%  **********----> How do you get it? ??????/
11.DS
一四边形KPMQ（逆时针方向），四边相等。求KM？
1.KP=2
2.PQ=2
答案：C **************-----> D
-----------------------------------------
16、DS
The number of boys in a class and the number of the totle of boys and girls who take the course of biology is shown in the form blew, How many is all the boys and girls in the class.
表格 take biology not take biology totle
----------------------------------------------------------
boy 28
----------------------------------------------------------
girl
----------------------------------------------------------
totle 36
1. There are 3 boys who do not take biology
2. The girls in the class is twice as many as the totle of boys and girls who do not take biology
-------------------------------------
C  *************-->E
==================================
4. To go a 405 miles trip, a car can go 36 miles per gallon for gasoline A , and for gasoline B, the efficiency decreased by 1/3 of A, ask during this trip, the car can save how many gallon of gasoline A for whole trip than it uses gasoline B?
-----------------------------------------
405/120 =3.375 ****************----> 405/72= 5.62
========================================