我又不会做了,麻烦大家帮我看看吧

22. If p,q,r, and s are nonzero numbers, is
(p – 1)(q - 2)²(r – 3)³(s – 4)⁴ ≧ 0?

(1) q > 2 and s > 4

(2) p > 1 and r > 3

为什么这题不是选C,而选B呢?

24. All trainees in a certain aviator training program must take both a written test and a flight test. If 70 percent of the trainees passed the written test, and 80 percent of the trainees passed the flight test, what percent of the trainees passed both tests?

(1) 10 percent of the trainees did not pass either test.

(2) 20 percent of the trainees passed only the flight test.

这题也不会做555...大家能告诉我详细的解题思路么?

9. Of the 230 single-family homes built in City X last year, how many were occupied at the end of the year?

(1) Of all single-family homes in City X, 90 percent were occupied at the end of last year.

(2) A total of 7,200 single-family homes in City X were occupied at the end of last year.

这题为啥选C?230在题目中起了什么作用?

还顺便问一句,是不是0也是偶数?

劳驾大侠们看看,深深地表示感谢!

lwei1016大侠,谢谢您的详细指点,我已经明白了.

22题我太不仔细了,奇数次方是有可能为负数的,呵呵......

24题我也想过您说的解题思路,可是我总是喜欢把问题想得很复杂, 后来都变糊涂了555......

9题还是不太明白230在题目中起什么作用

in summary, thanks a lot to lwei1016 gg

0是偶数(能被2整除)

偶对第9题的看法,请数学nn指教

题目问的是X城去年建的那230套房里有多少套在年底住上了人?

(1) Of all single-family homes in City X, 90 percent were occupied at the end of last year. 条件1说的是X城所有的房子里90%都是occupied的,但是不知道去年的那230套是什么状态

(2) A total of 7,200 single-family homes in City X were occupied at the end of last year 条件2说的是7200套住着人,也无法知道230套的情况

结合1和2,只能知道总套数是7200/90%,还是不能知道去年230套的情况,所以答案应该是E

插一句哦：

1.　关于0(零)
1)　0是一个整数；
2） 0是偶数

第九题我也认为选E的,可是看了答案就让我没信心了.不知道是不是答案错了, mariezhu 妹妹讲的我也考虑过.谢谢大家帮我解惑

by the way, 不好意思再开新贴,借宝地再问一题(快考试了,心情比较急切,请大家原谅......)

23. The participants in a race consisted of 3 teams with 3 runners on each team. A team was awarded 6 –n points if one of its runners finished in nth place, where 1 £ n £ 5. If all of the runners finished the race and if there were no ties, was each team awarded at least one point?

(1) No team was awarded more than a total of 6 points.

(2) No pair of teammates finished in consecutive places among the top five places.

这题我没明白它的意思,好心的同胞们麻烦您细细看看咯.答案是选A.

这是og上的83题。

（1）既然说了没有队过六分，所以这总的这十五分，分给三个队，就每个队至少有三分。所以 A.

(2 )  没有同队的队员在一到五的位子上连续排，所以只能是有个队得分为 5， 3 ，1， 总为9； 另个队是4 ，2， 总为6，这样15分就分完了，第三个队可以为0分。 故，不能选b.