半岛姐妹复习日记

spzeng

以下是引用小猪sisi在2007-10-24 11:21:00的发言：

讨论一道数学题吧

我看不懂题

A circular rim 28 inches in diametera rotates the samenumber of inches per second as a circularrim 35 inches in diameter.If the smaller rim makes x revolutions per second how many revolutions per minute does the larger rim take in terms of x?

答案是x*60*28/35=48x么？

blackblue

spzeng牛牛啊！

小猪sisi

以下是引用jiejie219在2007-10-24 12:09:00的发言：

小猪SISI的数学题我考虑了一下，是这样的：（欢迎大家拍砖）

A circular rim 28 inches in diametera rotates the samenumber of inches per second as a circularrim 35 inches in diameter.If the smaller rim makes x revolutions per second how many revolutions per minute does the larger rim take in terms of x?

题的意思是：两个圈，一大一小，小的直径28，大的直径35，两个圈每秒钟转的inch数是一样的。问，如果小圈每秒钟转X圈的话，大圈每分钟转多少圈（用X表示）。

我的解题思路：

其实就是像皮带轴一样的，两个圈周长算出来，只是因为周长不一样大，所以导致圈数不一样。

小圈周长28pai，每秒钟转X圈，那每分钟转60X圈，每分钟转的inch数是：28pai/60X

大圈周长35pai，设每分钟转的圈为Y，那大圈每分钟转的inch数是：35pai/Y

两个圈每秒钟转的inch数是一样的，那每分钟也是一样的，所以：

28pai/60X=35pai/Y

Y=75X

答案是48x 你讲的意思我明白了，不过按照你说的，等式应该是28pai*60*x=35pai*y   这样是48x

amorela

累啊累啊

小猪sisi

小f

换头像了呀！！我喜欢原来那只

明天篮球比赛，是场艰苦的比赛~~~~

jiejie219

啊偶～～除法，我这个笨脑袋。。谢谢sisi！

F你把头像换回来，那个更可爱!

yoyo88

姐妹们，

刚才做了一套GWD，狂错！

比1战前错的都多，那我这段期间岂不是白复习了！

通过这段期间的分类练习，自我感觉提高不少，

怎么一做套题就打击成这个样子呢？胸闷啊！

刚才确实状态不是很好，今天白天工作比较忙，做题时头疼来着，

但是也不能影响这么多啊！

jiejie219

YOYO不要急，再做一套。有时候一套说明不了问题的。对自己有信心！

大洋彼岸369

YOYO,我最近做GWD也有点找不到感觉,特别是SC,最有把握的现在变成最没把握的了. 以前OG的总结有些在GWD中不适合.可能是自己还没有真正吃透吧.YOYO别着急,倒不如静下心来看看为啥错.就快考试了,希望我们都能考出自己满意的成绩.

今天做了一套PREP,数学比上次有很大进步,V部分很多CR都是OG里面的,没啥大的参考价值. 革命尚未成功, 同志仍需努力....

这回查了黄历,选了这次的好日子,希望真的能带给我好运.

blackblue

姐妹们讨论一道题

GWD 10-41

In 1713, Alexander Pope began his translation of the Iliad, a work that, taking him seven years until completion, and that literary critic Samuel Johnson, Pope’s contemporary, pronounced the greatest translation in any language.

 A. his translation of the Iliad, a work that, taking him seven years until completion, and that literary critic Samuel Johnson, Pope’s contemporary, pronounced

B. his translation of the Iliad, a work that took him seven years to complete and that literary critic Samuel Johnson, Pope’s contemporary, pronounced

 C. his translation of the Iliad, a work that had taken seven years to complete and that literary critic Samuel Johnson, Pope’s contemporary, pronounced it as

D. translating the Iliad, a work that took seven years until completion and that literary critic Samuel Johnson, Pope’s contemporary, pronounced it as E. translating the Iliad, a work that had taken seven years to complete and literary critic Samuel Johnson, Pope’s contemporary, pronounced it
    

答案是B. DE中的it指代什么？ B中的两个that都指代什么？ 还有句子的结构是怎样的？

[此贴子已经被作者于2007-10-25 6:39:38编辑过]