46. a bouquet consists of red and white carnations , randomly select two flowers , what is possibility of having one of each ?
1) the number of red carnations is equal to that of the white carnations
2) there are 6 red carnations in the bouquet.
答案:C

47. when positive integer a is divided by another positive integer b , the quotient is 5 and remainder is 3 , which of the following could be the value of a ?
1 ) 13 2) 38 3) 57
答案:13,38

48. line k and l intersect at point ( 16/5, 12/5 ) , what is the slope of line l
1) one of the angles formed at the intersection is 90
2) line k passes through the origin
答案:C

49. is 1000 a factor of k ?
1) 2000 is a factor of 4k
2) 8 is a factor of k
答案:C

50. if lm+4l=2, what is the value of m?
1) m<0
2) m^2 +8m + 12=0
答案: 题目本来很容易,不过不理解lm+4l=2是什么意思?

51. is the total measure of interior angles in polygon p greater than 500 ?
1) the measure of one angle is 100
2) the polygon has more than 5 sides.
答案:B

52. if x@y =xy -x+y , a@b=0, what is a in terms of b ?
答案:ab-a+b=0
所以a(b-1)=-b
a=b/(1-b)

53. f(y)=ky, k is a constant , is f(-5)>0?
1) f(-2) <0
2) f(-3)f(-4)>0
答案:A

54 do jack and nancy together own a total of 10 pencils ?
1) jack owns more than twice the pencils owned by nancy
2) nancy owns less than 5 pencils .
答案:E

55. are m and k consecutive numbers ?
1) m+k=3
2) m-k =1
答案:B

56.x,y,z are three sides of a triangle , and xA y> 2^(1/2) B (1/2)*3^(1/2) D (1/4)*3^(1/2)
答案:题意不明确

57. 一个直角三角形，面积为1， 边长c
答案：b>根号2
bc=2 and b>c so b>根号2

58. 一个长方形，长10宽8，套上一个宽度相同的框，这个框的面积是144，求框的宽。
答案：3
2*(10+2X) + 2*8X =144

59. the range of the monthly salary in 1999 is 240, the range of the monthly salary in 2000 is 320, ask what is the minimal range of the monthly salary in both 1999 and 2000.
A: 80
B: 240
C 320
D: ***
E: ***
答案:320

60.从12个红球和12个兰球里选2个， 全是红的概率：
答案:C12,2/C24,2