7月17GRE数学考后最新真题回顾 不知道错在哪里就赶紧来看
- 2016年07月21日11:20 来源:小站教育作者:orangejojo
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数学部分
直接计算题
1. According to a tax rate formula for a certain year, the amount of tax owed by an individual whose annual income was between $31,850 and $77,100 was equal to a base tax of $4,386 plus 24 percent of the annual income that exceeded $31,850. According to this formula, what was the amount of tax owed by an individual whose annual income that year was $42,000?
答案:6822
解析:题干问,某一年个人收入在$31,850到$77,100之间的税收计算方式为$4,386加上超出$31,850部分的24%。问收入为$42,000的个人这一年需缴纳多少税?
所以我们可以得到所缴税的计算方式=4386+24%*(42000-31850)=6822.
大小比较题
2. x=2, y=3,z=5
Quantity A: x^-1*y*z^-2
Quantity B: (y/xz)^2
A. Quantity A is greater.
B. Quantity B is greater.
C. The two quantities are equal
D. The relationship cannot be determined from the information given.
答案:A
解析:A的值= x^-1 * y * z^-2=1/2*3* 1/25=3/50
B的值= =(y/xz)^2=9/100
因为A=0.06,而B=0.09,所以A>B.
3. x < y-2
Quantity A: The average (arithmetic mean) of x and y
Quantity B: y-1
A. Quantity A is greater.
B. Quantity B is greater.
C. The two quantities are equal
D. The relationship cannot be determined from the information given.
答案:B
解析:A的值=(x+y)/2, B的值=y-1.
所以A-B=x/2+y/2-y+1=(x-y)/2+1
由题干得,x < y-2,所以x-y<-2
因此,(x-y)/2+1<0
则A
图表理解题
4.
X |
Frequency |
0 |
6 |
1 |
11 |
2 |
18 |
3 |
23 |
4 |
15 |
The table shows the frequency distribution of the random variable X. What is the median of the distribution of the values of X ?
A. 1.0
B. 1.8
C. 2.0
D. 2.5
E 3.0
答案:E
解析:题干要求变量X值的中位数,表格左侧为数值,右侧为出现次数。
因为总的次数=73,所以中位数是第37位,则落在数值3上。
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