GWD3的几道数学题，求赐教

rebeccatj · 发表于 2012-10-28 22:46:41

Q14:

How many seconds will it take for a car that is traveling at a constant rate of 45 miles per hour to travel a distance of 22 yards?(1 mile = 1,160 yards)

A.8

B.9

C.10

D.11

E.12

Answer: 我觉得是用22去除以（45*1160）/3600算不出选项的答案啊~

Q20:图不知道怎么回事，我叙述一下，就是求三边分别为abc的三角形中c所对的那个角X>90度？

x°

a

In the triangle above, is x > 90?

(1)a² + b² < 15

(2)c > 4

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: 这类题，我一直都不是很会，但是这题给的条件无非是c是最大边嘛，但是若ab对角都是55左右的，则最大角也只有70度啊，难道要用两边之和大于第三边？
Q26:

(n-x) + (n-y) + (n-c) + (n-k)

What is the value of the expression above?

(1)The average (arithmetic mean) of x, y, c, and k is n.

(2)x, y, c, and k are consecutive integers.

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: 得出ｖａｌｕｅ＝８ｎ那８ｎ也是值了？不需要晓得ｎ吗？

rebeccatj · 发表于 2012-10-28 22:47:25

补充一下哈，我的答案是红色，正解是蓝色

rebeccatj · 发表于 2012-10-28 22:47:38

真心求教

rebeccatj · 发表于 2012-10-28 22:48:01

谢谢大家

jjfish191516 · 发表于 2012-10-29 18:32:54

第三题呢~(1)里如果四个数的average是n的话~~~那结果必然是0，对吧~比如2468，你算下~~~画图可得
（2），同理，也可画图，你发现不知道N在那个位置~~所以答案不定

rebeccatj · 发表于 2012-10-30 20:58:43

第三题呢~(1)里如果四个数的average是n的话~~~那结果必然是0，对吧~比如2468，你算下~~~画图可得
（2），同理，也可画图，你发现不知道N在那个位置~~所以答案不定

-- by 会员 jjfish191516 (2012/10/29 18:32:54)

嗯，我知道了，谢谢你啦~

midnightsunz · 发表于 2012-11-2 19:41:37

第一题是1 mile = 1,760 yards，不是1160

rebeccatj · 发表于 2012-11-3 23:24:31

好的，谢谢你哦~

GWD3的几道数学题，求赐教

HH

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