输血基金646，解答看不懂，请教

小困蛇 · 发表于 2011-9-13 17:58:17

Newsweek NYT 有关此类话题文章的阅读量，而最佳方法之一就是多访问此类网站，像中国学生熟知的《the economist》，《forbes》，《fortune》，《the wall street journal》等

African American Review —— social sciences (some humanities)

　　American Journal of Economics and Sociology——social sciences

　　American Scholar —— humanities

　　Art Journal —— humanities

　　Astronomy —— physical sciences

　　BioScience —— biological sciences

　　Black American Literature Forum —— humanities

　　business Horizons —— business

　　Commentary —— social sciences

　　Discover —— biological sciences and physical sciences

　　Feminist Studies —— social sciences (some humanities)

　　Journal of American Ethnic History —— social sciences

　　Journal of Black Studies —— social sciences (some humanities)

　　Journal of Social History —— social sciences

　　The Nation—— social sciences

　　Science News —— biological sciences and physical sciences

　　Scientific American—— biological sciences and physical sciences

　　Sloan Management Review —— business

　　Smithsonian —— social sciences, biological sciences, and physical sciences

　　Technology Review —— biological sciences and physical sciences

　　Wilson Quarterly —— social sciences

　　Women.s Review of Books —— humanities

　　其中很多期刊可以在学校图书馆中找到，考生可以课外泛读，作为长期积累，提高阅读根本能力的途径之一。
646-329
DS:一个三角形，每个角的大小都<90?

(1) 三条边是 3，4，6

(2) abc是三条边, a<b+c<a+2（最后一个好像是a+2……有点糊涂，对不住）

A

1）可以，根据公式

2）这个不确定，有谁确定站内短我

9 5 更新：

2）可以确定了，只有一种判断情况就是根据a^2 b^2 c^2的关系

一下是LZ用来备忘的：SC和CR基本都是JJ里的题，楼主直接照着机经来的。回忆一下SC：
1、A’s（某个人）study：XXX(书名)，concentrated on the musicians who carried out the tradition established by B, as well as C（B和C是人名）—or they had developed the theory to intellectual form of jazz.
A.out the tradition established by B, as well as C — or they had developed the theory
B.out the tradition estabilished by B, as well as C and who developed the theory
c.out the tradition estabilished by B ,as well as C — or who had developed the theory
D.on the the tradition estabilished by B, as well as C and they had developed the theory
E.on the the tradition estabilished by B, as well as C and who had developed the theory
2、The thunderstorms warning,xxxx(插入语，意思是“在八点钟”，具体表述忘了，没有划线，不影响做题)，has been canceled,about one hour before it was to maintaned.
A. canceled,about one hour before it was to maintaned.
B. canceled about one hour before it was scheduled.
其他的选项记不准确就不误导大家了，主要区别点是：1、有没有逗号，2、it was 后面的东西。楼主选的B，所以记得这个。但是楼主的老公说，从题目看应该选有逗号的选项。大家参考吧。
另外，考了not only , but also接谓语的平行结构，而且是在一个由which引导的非限制性定语从句里面，时态和平行要准确。
努力多参加同城线下活动、发原创微博、微群内发言以提升积分，积分达到200即可再次升级为微博达人。

bitsera · 发表于 2011-9-13 18:25:19

利用余弦定理 cosA=b^2+c^2-a^2/2BC 如果小于零就说明A是钝角啊第二个举出反例就行了

小困蛇 · 发表于 2011-9-13 18:39:25

同意，【（b＋c）²-2bc-a²】/2bc a＜b＋c＜a+2 取极值【a+2】方举反例可行
xiexie

鸡蛋花 · 发表于 2011-9-21 00:26:45

第二个条件还是不懂！！
哪位热心人能帮忙解释一下楼上的这个取极值是谁取极值吗？怎么又是反例呢？
是要把b+c取极值为a+2吗，然后来计算cosA吗？可是算不出来啊？
过程为
(b+c )^2=(a+2)^2=a^2+4a+4
cosA=(b^2+c^2-a^2)/2bc
=(4a+4-2bc)/ 2bc
然后就不会做了.....
请NN们解答，万分感谢！

输血基金646，解答看不懂，请教

欢迎使用中国移动WLAN业务，帐号：13777096850，密码：621860，如需帮助请拨打10086。

所属分类: GMAT考试

正在浏览此版块的会员 ()

浏览过的版块