[求助]考古題 2題

l18david

因無明顯出處，所以無法注明來源，請各位大俠或版主幫一下忙，謝謝！

計量：

1.One side of a triangle has length 6 and a second side has length 7. which of the following could be the area at this triangle?

甲.        13

乙. 21

丙.        24

(A) 甲 only

(B) 乙 only

(C) 丙 only

(D) 甲 and 乙 only

(D) 甲，乙 and 丙

答案：(E)        解題方向: S=(a+b+c)/2        ,        Area=根號S*(S-a)*(S-b)*(S-c)

我選 (D) 因為6*7/2=21, 但24大於21，所以不可能為答案阿~        困惑???

資料充分性：

(2)A rectangular lot 120 feet long by 80 feet wide os to be partitioned into 10 rectangular gardens. If each of the gardens will have the same dimensions, how many feet of partitioning will be needed to separate the gardens?

(甲) One of the dimensions of each garden is to be 40 feet.

(乙) One of the dimensions of each garden is to be 24 feet.

Answer: (D)兩者皆充分。

不懂耶，題目是不是問 將120*80的土地,分成10個相等"面積?"長方形，那麼有多少個"feet of partitioning will be needed to separate the gardens?"--這一句看不懂到底要求什麼?所以答案就看不懂了...

感恩~

[此贴子已经被作者于2005-3-18 23:40:28编辑过]

andrew_li

1.

I agree with you. The area of this triangle, S, is (1/2)*6*7*sinθ.

0 < S <= 21

It can not be greater than 21.

2.

It means the length of those lines that you need to divide the original rectangular into 10 smaller ones.

l18david

以下是引用andrew_li在2005-3-18 0:17:00的发言：

It means the length of those lines that you need to divide the original rectangular into 10 smaller ones.

謝謝andrew，不過，您同意他的解答嗎?出這種題目會不會很無聊...?

因為，既然每一個small one都各邊一樣長，又告訴我們其中一個邊長，真奇怪...