临阵磨刀霍霍向gmac-问几个数学题

hellokelly

希望大家助我一臂之力~

beat gmac

谢谢~问题比较幼稚，所以才需要帮忙

真害怕掉进低分库

2.       (DS) what is the value of n.

Twice n equals to n plus 8

 N Times N equals to 8N

没有搞清楚是什么意思,就选了B,觉得N^N 等于8N 有一个解在2和3之间就选了B

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for 1, 2n=n+8, we could know N, right? Why lz choose B? Apparently, we could get n from 2

3.       (DS)X小于1

(1)X 小于X 开三次方

(2)X的三次方小于X
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for this one, if we guess x>1, then, neither 1 and b is right, so could the answer be d?
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一个cube, 边长为4, EF 的中点跟CD的中点距离. 

机经作者答案: 2 SQUARE(6) why?

     

3.

the range of group of junior and senior is 21,and the median of junior is less than the median of senior, and is the greatest of junior equal to the least of senior.

(1) The range of junior is 11

(2) the range of senior is 10

5.数轴上显示A 1/5和 B 1/2. AX=3BX, 问X是多少，
    本来不难算，但是图上的X在B点右边，其实应该在AB之间。这道题还是前10道以内 17/40
    

6.(n-1)^3>750 why n>11?I think n-1>9

7.

a = 2^-2 - (1/3)^(-3) + (1/4)^4    問a的範圍？

　 =>ａ＜　－２５

8.

(|X| + 1) / |X + 1|等于几？ 

1. x < 0  

2.|X| > X.

9.

问的是a>1吗？

根据条件1求得a>1或者a＜-1,

根据条件2求得a>0，所以选E。

其他题目还有f(x)函数代式子类等等

 I guess from 1 and 2 we know a>1

10

. 2A3+  3B6=669  问A 也不知道问B的值（1）A是3的倍数

（2）3B6是9的倍数

for 2, I got b=0

thanks a million guys!!!

[此贴子已经被作者于2009-3-27 11:49:50编辑过]

smartyan1981

2. A, i think since from condition 2, we could get 2 answers, n=0 or n=8

3. D, i think condition 1= condition 2

x^3-x<0 => x(x^2-1)<0 =>x<-1 or 0<x<1

hellokelly

up up~