1 If x is a negative inter, which of the following expressions has the least value?

A  x^2-0.50

B  x^2-0.51

C  x^3-0.502

D  x^3-0.511

E  x^4-0.512

Answer: D

我觉得不管包不包括-1都不该D 呀

2 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

A between 2 and 10

B between 10 and 20

C between 20 and 30

D between 30 and 40

E grater than 40

Answer: E

这题是怎么一个思路呢？完全不知道

3 The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged

D 40% increase

我觉得应该100%呀， 可没这个选项

Answer: D

4  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?

A:13

Answer: A

不知道应该怎么做，也不可能试数亚

我试着答一下：

1、因为X是负数，X^2和X^4M则一定大于0，而在选项中只有x^3是负数啦，只能选c或d.而C、D比较很明显就是d小啦。

2、根据条件方程式可表达为：h(100)+1=2*4*----*100+1 =(2-100*2)/(1-2)  +1=199.

  而199本身就是质数，自然选E为大于40的数啦。

3、没看太懂，觉得是不是给的条件不足啊。

4、可分解成75=5^2+7^2+1^2   而5+7+1=13.

三，题目要读懂，就是两次比例不变，求variability

A^2(1+x)^2=2A^2

x=0.4=40%