gre数学考试关于算术的重点试题(6)
1.On a certain number line， if-7 is a distance 4 from n and 7 is a distance of 18 from n then n=A.25
B.11
C.3
D.-3
E.-11
答案：E
2. Which of the following equations can be used to find the value of x if 7 less than 5x is 5 more the product of 3 and x？
A.5x-7=5+3x
B.5x-7=5+（3+x）
C.7-5x=5+3x
D.7-5x=（5+3）x
E.7-5x+5=3x
答案：A
3.On a number line， the distance between the two points with coordinates -5 and 1 is how much less than the distance between the two points with coordinates 2 and 14？
A.6
B.8
C.10
D.12
E.16
答案：A
4.The expression （4+x）（2x-3） is equivalent to which of the following？
（1）2x（x+4）-3（x+4）
（2）（x-4）（2x+3）
（3）2x2-12
A.（1） only
B. （2） only
C. （3） only
D. （2） and （3）only
E. （1），（2） and （3）
答案；A
gre数学考试关于算术的重点试题(6)
</p> 5.On the number line， 1.4 is halfway between which of the following pairs of numbers？A.-1.4 and 2.4
B.-1 and 2
C.-0.3 and 3.1
D.0.15 and 1.55
E.0.4 and 1
答案：C
6.If the sum r+s is 2 less than the difference r-s， then s=
A.-2
B.-1
C.0
D.1
E.2
答案：B
7.The value of y will decrease as the value of x increases in which of the following equations？
A.y=x
B.y=x-2
C.2-y=3-x
D.2x-y=4
E.x+2y=1
答案：E
8.What is the cost， in cents， of using a certain fax machine to send n pages of a report if the total cost for sending the first k pages is r cents and the cost for sending each additional page is s cents？（assume that n>k）
A.r+s（n-k）
B.r+s（n+k）
C.rs（n+k）
D.kr+s（nk）
E.kr+ns
答案：A
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