gre数学考试关于算术的重点试题(6)

会计考友

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
( H+ t# I1 x5 U  m    D.-3
. `& V$ \/ o. a7 r: \$ r    E.-11
1 t9 ~6 D2 g3 g9 K- Z7 r    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
% {  ]) Q) N6 l* D* ?) K1 G    B.5x-7=5+（3+x）
, |* c6 d! }, V6 T6 T) P% M    C.7-5x=5+3x
. N7 {. k" ~" p, E. `+ a    D.7-5x=（5+3）x
  Z3 Q5 S- m6 R2 f    E.7-5x+5=3x
    答案：A
$ {# u2 P$ j- I5 X7 q    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？
# t" c9 U' N/ {, {4 V$ M" V    A.6
    B.8
    C.10
1 s, o' C. ^" |& W  f; q1 x    D.12
    E.16
    答案：A
    4.The expression （4+x）（2x-3） is equivalent to which of the following？
* b; m0 x! n; K0 {+ \/ N1 N    （1）2x（x+4）-3（x+4）
    （2）（x-4）（2x+3）
9 B4 |; N' g! V3 ?3 e5 i    （3）2x2-12
    A.（1） only
    B. （2） only
    C. （3） only
9 l: A$ `4 g- g- |5 `! l# S! B    D. （2） and （3）only
    E. （1），（2） and （3）
* P5 k  y8 z! Y+ O
    答案；A

会计考友

</p>    5.On the number line， 1.4 is halfway between which of the following pairs of numbers？
) W3 t& K, [" P5 Y* n* B3 n2 e+ N    A.-1.4 and 2.4
% P1 U/ ~" u& o/ B6 `- ]    B.-1 and 2
" U; X0 T$ [* R  l    C.-0.3 and 3.1
    D.0.15 and 1.55
6 n, y0 E4 L% a    E.0.4 and 1
    答案：C
    6.If the sum r+s is 2 less than the difference r-s， then s=
& F% ?+ U) R4 {% P7 `    A.-2
    B.-1
8 m8 s, q( p# g/ h' g5 J% b    C.0
7 v. |6 J( J7 `7 @; ?2 E    D.1
. G2 l) t2 E. D/ P% K    E.2
    答案：B
    7.The value of y will decrease as the value of x increases in which of the following equations？
3 }+ h  |) [+ P) E. F    A.y=x
    B.y=x-2
    C.2-y=3-x
% p* S" M1 U" _  c    D.2x-y=4
    E.x+2y=1
2 D$ C' e& I/ ?0 z    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）
' h% B+ z) n3 b) T    C.rs（n+k）
3 A9 G; U" A+ s, h) t9 t    D.kr+s（nk）
) u" h6 D; v- {    E.kr+ns
# R& r0 c; `& l8 ^9 q    答案：A