吐血题…救救..救~我...啊~

Q29:

For which real numbers x is the expression  2/[(x-2)(x+1)] not defined?

A.   x = 0 only

B.   x = 2 only

C.   x = –1 only

D.   x = –1 or 2

E.    x = –1, 0, or 2

ANS

不懂题目的意思??
   

Q28:

A certain company expects quarterly earnings of $0.80 per share of stock, half of which will be distributed as dividends to shareholders while the rest will be used for research and development.  If earnings are greater than expected, shareholders will receive an additional $0.04 per share for each additional $0.10 of per share earnings.  If quarterly earnings are $1.10 per share, what will be the dividend paid to a person who owns 200 shares of the company’s stock?

A.     $92

B.     $96

C.   $104

D.   $120

E.    $240

Ans: C

好难懂的题目….??

Q22:

Four extra-large sandwiches of exactly the same size were ordered for m students, where m > 4.  Three of the sandwiches were evenly divided among the students.  Since 4 students did not want any of the fourth sandwich, it was evenly divided among the remaining students.  If Carol ate one piece from each of the four sandwiches, the amount of sandwich that she ate would be what fraction of a whole extra-large sandwich?

E.     (4m-12) / [m(m-4)]

Ans:E

题目…(吐血)…看不懂…列不出式子…

Q8:

S is a set of points in the plane.  How many distinct triangles can be drawn that have three of the points in S as vertices?

(1)     The number of distinct points in S is 5.

(2)     No three of the points in S are collinear.

ANS: C

Q32:

In the decimal representation of x, where 0 < x < 1, is the tenths digit of x nonzero?

(1)     16x is an integer.

(2)     8x is an integer.

ANS:B

为什么不是E??
    

条件一和二中的X都可以是0.25 和 0.5阿

1，问什么时候式子不成立，分母等于0的时候

2，[0.4+(1.1-0.8)*0.4]*200

3,意思是，4块SANDWICH，M个学生，3个分成M份，第四个分成M-4份，叫C的人每个饼的吃了一块（汗），问她吃的占一个饼的多少

4，5个点都在同一直线就不能画三角形了

5，问小数点后第一位是不是非零，条件2肯定不是零

LZ要加强阅读哦~~

试着回答以下

1，X取何值，表达式不成立， 分母为零，无意义

2，每股盈利0.8，一半分红，一半作研发费用。如果每股收益超过0.8,每超过0.1，分红0.04。今年每股收益1.10，问，200股能分多少？

   每股分红：0.8内的分红是0.4；超过0.8的分红是（1.10-0.80）=0.30，分红（0.30/0.1)*0.04=0.12

   所以今年每股分红，0.4+0.12=0.52。 200股分红是104

3， 有4块蛋糕，m个学生分。其中三块，平均分配。最后一块，有4个学生没吃，在其余学生中间平分。C吃了所有4块蛋糕中的每一块。问，C吃的是一块蛋糕中的几分之一。

   设1块蛋糕大小是1，前三块每人吃的是3*1/m，第四块，每人吃1/（m-4）

   最后的结果是[3/m + 1/(m-4)]/1 = (4m-12) / [m(m-4)]

4, 考三角形的定义。只有下面两个条件都成立，才能为一确定三角形

   1有多少个不同的顶点

   2任何3个顶点不再一条直线上。

5，前面有人解过的

   1)  0<16x<16   最大最小值 1和15   带入最小值1/16=0.0xx,十分位是0，不成立

   2)  0<8x<8     最大最小值是1和7   带入最小值1/8=0.125, 十分位都大于0，可以确定。