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[GRE数学] gre数学考试关于算术的重点试题(6)

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发表于 2012-8-15 12:55:17 | 显示全部楼层 |阅读模式
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=
* J7 e8 R/ M" x0 f% d    A.25
! L) T5 V2 W% d1 J# |    B.11
4 D. C/ j- ]0 R$ L+ Y" g+ H    C.3
5 H0 J6 N9 B- a    D.-3' V; ?9 w6 p7 N: u! ?" [" x4 S4 @
    E.-11
* g7 E6 X0 \5 |0 {1 t- W    答案:E
  {( Z. S! y+ Z, b* R7 f    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?
6 B: [6 x- J& m" s) o# R9 n    A.5x-7=5+3x( q0 x- a2 @1 }
    B.5x-7=5+(3+x)
( T4 \1 o2 U- W  r5 P) T    C.7-5x=5+3x
2 I9 M1 T' i) K5 W    D.7-5x=(5+3)x
1 F1 O  J' R# I' r% g( r    E.7-5x+5=3x) G  Z+ A1 P* u+ e( }4 h+ T
    答案:A3 M1 @5 K0 I: S1 ]
    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?
2 w7 W! O1 W  i    A.69 w- }+ e- N  v$ Y
    B.8& {5 O% q9 e  f: O" I
    C.10
% g2 s6 I- _  G# ^/ M; ^) u+ N    D.124 R' R3 }/ |3 B4 H4 k8 a
    E.16
7 j/ U& g6 ^& \2 S& d0 O/ K    答案:A  D& ~, M$ U, l  b
    4.The expression (4+x)(2x-3) is equivalent to which of the following?
- y0 u0 |0 `; x# m( a3 u& t6 r    (1)2x(x+4)-3(x+4): S' Q9 R' X5 S3 f9 j3 `
    (2)(x-4)(2x+3)
. ?6 y, g2 ~* `- J$ {    (3)2x2-121 k  \' U- h: _2 o! P
    A.(1) only5 i0 Y3 z) W! O  w" ]. k
    B. (2) only
3 N3 N* J# I- `0 [  a( z$ k& T5 c6 Q    C. (3) only( K/ Z, ~& Z0 c& A
    D. (2) and (3)only
. Z, O& e( C+ ?, l% C    E. (1),(2) and (3)
* ?+ X6 u5 P: u- z
4 {& Z$ t7 z; e3 p* Y5 Y    答案;A
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 楼主| 发表于 2012-8-15 12:55:18 | 显示全部楼层

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?
  I1 h. h# m) d! ~, d/ G) Z    A.-1.4 and 2.4
8 j  |5 C  x' q& V# m    B.-1 and 2# s/ V- q$ p) E
    C.-0.3 and 3.19 Y5 |; T% |2 J: A& O1 W. q' s
    D.0.15 and 1.55
# }2 ~; W$ W9 w8 [% [) H    E.0.4 and 1
1 L$ U; B4 N& O    答案:C" J; G' W% i5 i% s6 U. j
    6.If the sum r+s is 2 less than the difference r-s, then s=* a7 K- A) s+ T3 B6 B$ y
    A.-2, P; W3 A7 X, B7 \/ Z
    B.-1( ^/ ?: Y5 W- ]0 s1 A) v
    C.0
: J  G/ D/ o1 Y6 ]( a0 [    D.1" |, |3 U( i5 G9 e$ t
    E.2
- ?+ B9 u2 w7 t* f- R. H; j  v( K    答案:B
2 D2 y8 f5 x9 Z' I. y    7.The value of y will decrease as the value of x increases in which of the following equations?
6 ?9 c( c7 M: ^, ^( w# ~    A.y=x. }/ a5 d2 j; g# w& n7 W7 a8 E
    B.y=x-2
$ O7 a6 z( {( t  k' p    C.2-y=3-x  W1 r0 }' i0 `! Y' U, g
    D.2x-y=4
9 ~# P$ z9 l/ }8 k/ T( f' h7 F0 W    E.x+2y=1
1 i1 R% B; V; P7 O& h    答案:E
7 C& J- A) b  v8 `; \$ S/ B' G    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)5 E. f: W* Q  [" d7 R
    A.r+s(n-k)
6 r; i: g5 c% l3 x- |/ B& U4 @) Z    B.r+s(n+k)& H8 y9 {+ M0 w" M2 l
    C.rs(n+k)
* ]0 I. C( v# z* a& |    D.kr+s(nk)
- B6 @/ P6 K' B9 v9 z4 `    E.kr+ns' w: f& k- q4 @
    答案:A
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