謝謝大家 題目都解出來了 算然換題了 但祝福大家考高分 也祝福我自己...请高人指点 打了好久的PP题目 帮帮我 被这几题搞的好沮丧….谢谢

ken92

Q1

For every positive even integer n, the function h(n) is defined to be the product of all the even integers from 2 to n, inclusive. If p is the smallest prime factor of h(100)+ 1, then p is ?

 

 

Ans : greater 40

为什么?? 完全没思路

Q2

If n is a positive integer less than 200 and 14n/60 is an integer, then n has how many different positive prime factors?

Ans:　３

为什么??是因为30是由2 3 5三个质数所组成的吗?

 

 

Q3

A furniture dealer purchased a desk for $150 and then set the selling price equal to the purchase price plus a markup that was 40% of the selling price. If the dealer sold the desk at the selling price , what was the amount of the dealer’s gross profit form the purchase and the sale of the desk?

 

 

Ans : 100

看不懂题目….

Q4

In the xy-plane , what is the y-intercept of line L ?

(1)  The slope of line L is 3 times its y-intercept.

(2)  The x-intercept of line L is -1/3

 

 

Ans: E

麻烦请讲详细一点
   为什么两个条件都不行呢??

Q5

If x and y are integers greater than 1 , is x a multiple of y ?

(1)3y^2+ 7y = x

(2)x^2 – x is a multiple of y
    

 

 

Ans : A

思路阿~~思路阿~~5555

Q6

The number 75 can be written as the sum of the squares of 3 different positive integers . what is the sum of these 3 integers?

 

 

Ans: 13

不会

Q7

A car dealer sold one car at profit of 25% of the dealer’s purchase price fo r that car and sold another car at a loss of 20% of the dealer’s purchase price for that car . If the dealer sold each car for 20000 , what was the dealer’s total profit or loss , in dollars, for two transactions combined ?

 

 

Ans : 1000 loss

看不懂
   我算出来是1000 profit 看错哪里了??

Q8

In a certain state , gasoline stations compute the price per gallon p , in dollars , charged at the pump by adding a 4% sales tax to the dealer’s price per gallon d , in dollars, and then adding a gasoline tax of $ 0.18 per gallon, which of the following gives the dealer’s price gallon d in terms of the price per gallon p charged at the pump?
    

 

 

Ans : d=(p- 0.18) / 1.04

看不懂题目

Q9

If n Is a positive integer and r is the remainder when 4+7n is divided by 3 , what is the value of r?

(1)  n+1 is divisible by 3
    

(2)  n>20
    

 

 

Ans : A

没有一点思路?? 帮帮我

Q10

A certain stock exchange designates each stock with a one- , two- ,or three- letter code, where each letter is selected from the 26 letters of the alphabet. If the letters may be repeated and if the same letters sued in a different order constitute a different code , how many different stocks is it possible to uniquely designate with these codes?

 

 

Ans : 18278

不会算…..

[此贴子已经被作者于2007-8-17 22:05:56编辑过]

恒迁

先答几个比较容易看出来的。。

Q10

26+26^2+26^3=18278

Q9

设n=3k-1 带进（1）就可以看出能整除

Q6

75=1^2+5^2+7^2

代数字试试就好

ken92

怎么没人帮我??

拜托! 我快考试了
                    还有很多观念不清
                    麻烦大家了
                    谢谢

拜托! 我快考试了
        还有很多观念不清
        麻烦大家了
        谢谢

shaoshao7

一下子打这么多题目，我看了一眼就直接想逃。

一题一题来，

h(100)=2*4*6*...*100=2^50*(1*2*3...*50).

h(100)可以整除1，2，3...50间的任何数，也就是说h(100)的质因数包含了所有1-50的质数。

而h(100)+1不能整除1到50间的任何数，也就不包含1-50的质因数，所以质因数>50。那么自然大于40了。

shaoshao7

14n/60是整数，那么n肯定有质因数2，3，5。

假设有4个质因数，第四个质因数最小是7，那么n最小是2*3*5*7=210>200了，假设不成立。

n只有3个质因数。

shaoshao7

是没理解markup的意思还是？

题目是说，家具商买进的时候是150，卖出的价格是（买进价格和卖出价格的40%）的和。红色字体就是markup。问如果按照这个价格卖出，他将获利多少？

假设卖出价格为x，x=150+40%x，0.6x=150，x=250。

获利是250-150=100元。

shaoshao7

直角坐标系中，问直线的y轴截距。

（1）斜率是y轴截距的3倍。

但是斜率不知道，y轴截距也不知道。

（2）x轴截距是-1/3

还是无法知道y轴截距。

再具体分析（1），根据（1）假设y=3ax+a，这里a是y轴截距，3a是斜率。

当y=0时，x=-1/3也就是说x轴截距是-1/3。那么其实这里（1）和（2）是等价的。

所以E

shaoshao7

题目问x是否是y的倍数，也就是说y是否是x的约数。

（1）x=y(3y+7),x是y的倍数明显成立。

（2）x(x-1)是y的倍数，但是不确定到底是x是y的倍数还是x-1是y的倍数。

举个例子，y=7,x=14或15都能使（2）条件成立，但14是7的倍数而15不是。

答案是A

呼呼~先这么多了，打字也好累的~

[此贴子已经被作者于2007-8-15 16:53:10编辑过]

fly_holly

呵呵，shaoshao先回答，俺工作一会

shaoshao7

其实偶一直在休息着