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5 is 1/5 of x
, @5 \% N7 d: C; N1 D比较x 与1大小?
m6 _7 b- @0 [0 s答案是A 5是X的1/5,所以X=5X5=25 大于1) o* {. T" N; ^) k" |# P' U
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2.
3 U. x0 t$ m, }/ w1 I$ V一个圆上有一点(Z,y),半径是5
; ?0 [4 [, D3 c3 H( cThe circle above with center O has a radius of 5
( m8 M0 U/ `: ^圆上的点(Z,y)的 y 与 20开根号比较
. g& V5 C9 U; \# a6 S& b. M答案是A,因为无论Y 在哪里都坐落于圆上,既它到O的距离为5>根号20/ Q" q' D7 Y7 x( E
3 which of the following points(x,y)is not on the graph of y<2x?4 K$ }0 e& D; I, r6 p! J
A.(-3,-7) B.(3,3) C.(2,-9) D.(2,2) E.(2,5)
! X* _+ m/ L, l2 j4 n) T) o) U首先是要问大家这是一个什么样子的graph呢?然后是对折刀题没有什么思路...4 ?( J2 h' p. ?+ @3 h1 E) c+ N
这道题是说x,y哪个不满足y<2x。这里只有E符合。
5 _ E2 D! U* @( h2 y4 A bicycle registration costs $2.5 in city x and $3.0in city y.At these rate, the cost of 4 registration in city x is k percent of the cost of 3 registration in city y; F. _, T+ _( z7 n, U
k 907 x1 ?- r) l/ G. V. |( k
这道题我是这样想的,4×2.5=k*3*3.0,课答案选的是A...+ W. v1 C1 ]# Y$ A7 a2 J
对呀你这样算出来的k=1.1,人家问的是k percent,所以要乘以100,得110.所以选A。
! X1 F% A) |5 r2 a. E' p5 In a rectangular coordinate system, line k has x-intercept 4 and slope -2 G' Y0 d* D+ _6 m! {# Y; e- K
the y-intercept of k 2
# @% V8 F: S+ W) J7 M这道题是因为我不能理解x(y)-intercept的意思...
; A8 {& c, U- |/ a: R" T* [可以列出方程式:y=-2(x-4)=-2x+8,当x=0时,y=8,即在y轴的截距为8.选A.
$ _! d, _# W, e- f2 y6 When it was found that 150 more tickets for the school play were sold than the seating capacity of the auditorium.It was decided to have two performances.If the total number of tickets sold was equal to the total number who attended and if the auditorium was 2/3 full for each of the two performances, what is the seating capacity of the auditorium?" i* f3 H/ q; P. Q
A.100 B.200 C. 225 D.300 E.450" ^: B6 o; ]/ B* i0 n
这道题我没什么思路,请牛人给出解释.主要是读题时头都大了.... t4 [. ~3 M* f
这道题的意思是:当学校演出所卖的票比剧院的容量多150个时,需要演两场。如果卖票数等于参加的人数,那么每场演出的人数为剧院容量的2/3.问剧院的容量?" k4 M r. o, l4 {! P, ~
设剧院容量为x,得:(x+150)/2=2/3 *x,得出x=450,选E.5 l+ I/ v6 t* Z m3 f, Z3 Y
7 the total area of 18 nonoverlapping circular regions,each having a diameter of 2 inches
/ w" ?! @( x4 b36 square inches 8 X6 e5 G& e/ B0 J) o" O' ]6 o
答案选A 我怎么觉得是D呢?
" X* k. Y1 w1 W( A! V, x题目到底是什么意思?
( g# o: b8 P: Q, L' P/ I这句话是说:18个不重叠的圆的总面积为多少?每个圆的直径为2.5 M5 L. o$ q3 q0 |% C* V9 X
所以18个圆的面积为:18派,大于36,所以选A" S8 \( n: I# I% V9 E5 u
8 the scores reported for a certain mutip;e-choice test were derived by subtracting 1/3 of the number of wrong answers from the number of right answers .On a 40 question test,if none of the questions was omitted and the score reported was 20. how many wrong answers was there? 5 10 15 25 30 选c
' q8 b8 \3 R. h. M! ^7 r设错了X个题,则对了40-X个,总分为40-X(对的题数)-1/3X(错的1/3)=20
5 C7 h5 \* ~$ p: @" c解出来X=15
/ f* ]: X+ z# g9 The tenths digit of .....是指十位数吗? - E/ S) ^: A. c7 Z' k
The tenths digit of为十分位,即小数点后第一位。! i0 [0 F9 X; }0 N7 q/ A- z
10 Olive oil, vinegar, and water were combined to make 10 cups of salad dressing. The oil and vinegar were mixed in the ratio of 2 parts oil to 3 parts vinegar.
" ?! D( Y0 x3 _1 u8 y10. The number of cups 5
$ N B) F9 _4 pof water used in the; V4 M9 m' K5 _) T" i
salad dressing5 y0 f6 W. P3 n! f; `: k
这题什么意思?
8 ~4 O% w& H# ^我的理解是,oil和vinegar的比例是2:3,即放2份的oil要放3份的vinegar,但由于并没有涉及水的比率也并不知道配制1杯sd需要多少oil或vinegar或水,所以无法判断配制10杯sd需要多少杯水。- P. Y1 i# t" S p
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[ 本帖最后由 steven0527 于 2006-10-17 11:15 编辑 ]