TTGWD 11-5，9-5，9-23讨论没找到

Q5:

The sides of a square region, measured to the nearest centimeters, are 6 centimeters long.  The least possible value of the actual area of the square region is

A.     36.00 sq cm

B.     35.00 sq cm

C.     33.75 sq cm

D.     30.25 sq cm

E.      25.00 sq cm

答案选D。不明白为什么不是E，解题思路应该是怎样的？

Q5:

If x and y are positive integers and y = (9-x)^-2, what is the value of y?

(1)     x < 8

(2)     y > 1

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

Answer，觉得（1）（2）都不符合的？

A.1/8    

B.    1/4

C.   1/3 

D.  3/8  

E. 1/2    

Answer: B，不会做，为什么不能按独立重复实验的概率公式来算C（3，3）*（1/2）^3

Q5:

The sides of a square region, measured to the nearest centimeters, are 6 centimeters long.  The least possible value of the actual area of the square region is

 A.     36.00 sq cm

 A.     36.00 sq cm

B.     35.00 sq cm

C.     33.75 sq cm

D.     30.25 sq cm

E.      25.00 sq cm

the nearest cm. is 6cm, 那么5.5cm<= side<6.5cm, ------> 30.25 sq cm<=area<42.25 sq cm 

偶觉得应该选E

Q23:

When tossed, a certain coin has equal probability of landing on either side.  If the coin is tossed 3 times, what is the probability that it will land on the same side each time?

 A.1/8    

 A.1/8    

 A.1/8    

B.    1/4

C.   1/3 

D.  3/8  

E. 1/2    

Q23:

When tossed, a certain coin has equal probability of landing on either side.  If the coin is tossed 3 times, what is the probability that it will land on the same side each time?

 A.1/8    

 A.1/8    

 A.1/8    

B.    1/4

C.   1/3 

D.  3/8  

E. 1/2    

为什么回帖会出现2次重复内容呢

o!Q23明白了！谢谢！

Q5的E答案对的话，那么题目中的the nearest centimeters 应该就是5 centimeters long啊。。但题目写明了是6，怎么有可能选D?

两题Q5还是不懂，自己顶一下。。

有人帮忙吗？？？

真不该做31套啊，，讨论的连接很少，答案又错得多。。

Q5:

The sides of a square region, measured to the nearest centimeters, are 6 centimeters long.  The least possible value of the actual area of the square region is

A.     36.00 sq cm

B.     35.00 sq cm

C.     33.75 sq cm

D.     30.25 sq cm

E.      25.00 sq cm

按照四舍五入,应该是5.5*5.5=30.25,答案D

to the nearest 意思是四舍五入，题意是四舍五入后是6cm为正方形的长，求最有可能的最小面积。

长是5.5cm，答案是D

MM，不要这么快就埋怨，你真的得用搜索功能搜索过吗？你说的题以前都讨论过，

分三次搜，关键词分别是

11-5
9-5
9-23