[原创]钢G连之杀G复习计划，情况差不多的朋友可以一齐加油！

madridprince

以下是引用slipknotjr在2009-5-11 8:23:00的发言：

小白，这个我也是看不太清楚，B 选项的不定式 有问题吗？

to do没问题 有sth be required of sb to do

madridprince

上两道prep数学题。。。发现现在智商明显下降。。。

148.
                15080-!-item-!-187;#058&010499

Amy's grade was the 90th percentile of the 80 grades for her class.  Of the 100 grades from another class, 19 were higher than Amy's, and the rest were lower.  If no other grade was the same as Amy's grade, then Amy's grade was what percentile of the grades of the two classes combined?

这题这个高亮部分是什么意思啊 怎么解释啊。。。

 

 

123.
                    12975-!-item-!-187;#058&009772

When positive integer n is divided by 3, the remainder is 2; and when positive integer t is divided by 5, the remainder is 3.  What is the remainder when the product nt is divided by 15 ?

 

(1) n - 2 is divisible by 5.

 

(2) t is divisible by 3.

看到remainder的题就有点晕 这题谁能帮说说该怎么想啊

xxz5838

Haven't studied much recently.

But bubble up!

ilhht

以下是引用天蝎座1107在2009-5-9 20:43:00的发言：

各位还在如火如荼地复习~

我要无语了。实习好累。每天7点45的晨会然后要到下午6点才下班。回到家就7到8点了。我住的地方办不了宽带，没办法每天上网了。也许周末来看看大家。

下周一要卖国债，这周五刚上了化妆课，这下太折腾了，每天还要早起化妆，不知道我的GMAT还能不能在两个月之内考完了。

很想念大家。我回去了。今天下好大好大好大的雨。

虎虎，一个人要好好照顾自己啊，能吃就吃，能喝就喝，吃饱喝好才不想家。

ilhht

明天中午出发去面试工作，要去两个地方，BF敲课押车，预计2天回来。希望有好结果。大家加油努力奋斗！！

ilhht

以下是引用madridprince在2009-5-11 10:04:00的发言：

上两道prep数学题。。。发现现在智商明显下降。。。

148.
    15080-!-item-!-187;#058&010499

Amy's grade was the 90th percentile of the 80 grades for her class.  Of the 100 grades from another class, 19 were higher than Amy's, and the rest were lower.  If no other grade was the same as Amy's grade, then Amy's grade was what percentile of the grades of the two classes combined?

这题这个高亮部分是什么意思啊 怎么解释啊。。。

 

 

123.
     12975-!-item-!-187;#058&009772

When positive integer n is divided by 3, the remainder is 2; and when positive integer t is divided by 5, the remainder is 3.  What is the remainder when the product nt is divided by 15 ?

 

(1) n - 2 is divisible by 5.

 

(2) t is divisible by 3.

看到remainder的题就有点晕 这题谁能帮说说该怎么想啊

第一个题目我觉得，0。9＊80＝72 （rank in class 1）
                                81 out of 100（rank in class 2）
两个和起来就是180－（ 8＋19）／180＝85％

ilhht

以下是引用slipknotjr在2009-5-10 8:29:00的发言：
周末大家都不在啊？

菜花，我对不起你，我语法不行啊，我看了你的题目，但是找不到合适的解释，等老头他们出来看看。加油！一直支持！

annajulira

以下是引用madridprince在2009-5-11 10:04:00的发言：

上两道prep数学题。。。发现现在智商明显下降。。。

148.
    15080-!-item-!-187;#058&010499

Amy's grade was the 90th percentile of the 80 grades for her class.  Of the 100 grades from another class, 19 were higher than Amy's, and the rest were lower.  If no other grade was the same as Amy's grade, then Amy's grade was what percentile of the grades of the two classes combined?

这题这个高亮部分是什么意思啊 怎么解释啊。。。

123.
     12975-!-item-!-187;#058&009772

When positive integer n is divided by 3, the remainder is 2; and when positive integer t is divided by 5, the remainder is 3.  What is the remainder when the product nt is divided by 15 ?

(1) n - 2 is divisible by 5.

(2) t is divisible by 3.

看到remainder的题就有点晕 这题谁能帮说说该怎么想啊

1)题目的意思 即 n-2 能被3整除，t-3能被5整除 

2）若(1) n - 2 is divisible by 5.则 n-2能被15整除，可设N为17，而T可设为8和13，nt/15的余数分别是

17*8/15=9...1，17*13/15=14...11,余数不是唯一，则排除A，D。

同理，(2) t is divisible by 3.可设t为18，n可设5和8， NT/15 为 18*5/15=6...0, 18*8/15=9...3,余数不唯一 排除B

3）(1) n - 2 is divisible by 5.(2) t is divisible by 3.合并，且 n-2 能被3整除，t-3能被5整除，则可设 n为17和32，t为18

nt/15  17*18/15=20...2, 32*18/15=38...2 余数确定为2 则选C。

不知道答案对不对啊，我想来想去就这个代入法比较好理解了，哪位高人还有更简便的方法最好，呵呵。

[此贴子已经被作者于2009-5-12 22:50:07编辑过]

slipknotjr

以下是引用madridprince在2009-5-11 10:04:00的发言：

上两道prep数学题。。。发现现在智商明显下降。。。

148.
    15080-!-item-!-187;#058&010499

Amy's grade was the 90th percentile of the 80 grades for her class.  Of the 100 grades from another class, 19 were higher than Amy's, and the rest were lower.  If no other grade was the same as Amy's grade, then Amy's grade was what percentile of the grades of the two classes combined?

这题这个高亮部分是什么意思啊 怎么解释啊。。。

the 90th percentile of  是说 Amy的成绩考了总得分的 90%的分数。

slipknotjr

最近大家都很安静阿，小白你六月考吗？