继续请教题目，涛涛30套里的。

sxcream

Q2:

In planning for a trip, Joan estimated both the distance of the trip, in miles, and her average speed, in miles per hour.  She accurately divided her estimated distance by her estimated average speed to obtain an estimate for the time, in hours, that the trip would take.  Was her estimate within 0.5 hour of the actual time that the trip took?

(1)   Joan’s estimate for the distance was within 5 miles of the actual distance.

(2) Joan’s estimate for her average speed was within 10 miles per hour of her actual average speed.

题目没怎么看懂。

Q11:

What is the remainder when the positive integer n is divided by the positive integer k, where k > 1?

(1)   n = (k+1)³

(2) k = 5

这道题目答案是A。我开始的时候光把K除来除去了，选了C.后来看了答案是A，就是光把K用几个值代一下就行了吗？

Is quadrilateral ABCD a square?

(1)   AB = BC = CD = DA

(2) x + y = 180

X，Y是相对的两个角。我不知道为什么选了个B.虽然印象中老师没教过这个，但是做题的时候一时也想不出其他的反倒。。。答案是E。

Q19:

Running at their respective constant rates, machine X takes 2 days longer to produce w widgets than machine Y.  At these rates, if the two machines together produce 5/4 w widgets in 3 days, how many days would it take machine X alone to produce 2w widgets?

这题我算出来答案是4,正确答案是12.不知道哪里算错了。

kittyclock

第三题不一定是正方形，可能是菱形，菱形四边相等，对角和是180度。

kittyclock

n=(k+1)(k+1)(k+1) n/k=(k+1)(k+1)(k+1) /k

sxcream

以下是引用kittyclock在2009/9/25 22:18:00的发言：

第三题不一定是正方形，可能是菱形，菱形四边相等，对角和是180度。

对角和是180度？？？？？菱形对角不是度数相等的吗？那不就是90度？

frankmfg

Q2: E?