5.27一道很怪的数学题+5.28号增加一道

119543213UID: 2759409

今天考场有一道题目是：

正方形内切于一个 isosceles 直角三角形，该三角形面积为r,求左下角小三角形的面


上面的题目信息是根据楼下补充完整的。鉴于我的记忆力不太好，但还在纠结一道题，于是就贴下来。


如果有什么信息缺失请跟帖。


5.28
又想起来一道题：一个有三条边quadrilateral of  ABCD分别是
7,8,9,问它的area和32那个大
当时看到3，又看到ABCD我就傻了。。。。




附作文题目
Issue
Governments should focus on solving the immediate problems of today rather than on trying to solve the anticipated problems of the future.
Argument7 Y+ Y7 q* g) p- x! i
?  A# k4 p1 r3 U  u, f
The following appeared in a memo from the new vice president of Sartorian, a company that manufactures men's clothing."Five years ago, at a time when we had difficulties in obtaining reliable supplies of high-quality wool fabric, we discontinued production of our7 p  m3 Z: c$ n/ K
deluxe alpaca overcoats. Now that we have a new fabric supplier, we should resume production. This coat should sell very well: since we have
offered an alpaca overcoat for five years and since our major competitor no longer makes an alpaca overcoat, there will be pent-up9 ]( H1 ~1 U" R/ C/ ]
customer demand. Also, since the price of most types of clothing has risen in each of the past five years, customers should be willing to pay
jsignificantly higher prices for alpaca overcoats than they did five years ago, and our company profits will increase."5 t, q4 W: t9 ?& O* e3 H3 h9 j
' F% G/ k( ~. ?# `
“Write a response in which you discuss what specific evidence is needed to evaluate the argument and explain how the evidence would+ R  H% S( i8 x% Q5 Q* Q- h
weaken or strengthen the argument.

coolctyUID: 3312866

这还叫怪啊？晕

得分无厘头UID: 3237303

2r/9

coolctyUID: 3312866

确实怪，因为或者它错了，或者你没给完整条件

bluegrass09UID: 2829939

2r/9
得分无厘头 发表于 2012-5-27 18:24

coolctyUID: 3312866

楼上答案是在等要指教三角形的条件下的。

宏观经济学UID: 2818832

好像是让求三角形ABE（具体字母忘记了）的面积吧 1# 119543213

119543213UID: 2759409

3# 得分无厘头
怎么算的=。=

matrushUID: 3253550

设边长为x，再各种等比弄下算出来吧，原来三角形的直角边是sqrt(2r)，正方形边长是2sqrt(r)/3。

maple1108777UID: 3207567

好像是让求三角形ABE（具体字母忘记了）的面积吧 1# 119543213
宏观经济学 发表于 2012-5-27 18:26

我也记得是求三角面积。。。

opewUID: 3309987

我也记得求的是左下角小三角形的面积，大三角形是等腰直角三角形。。。2r/9我算的是

coolctyUID: 3312866

9# matrush 不对

coolctyUID: 3312866

设边长为x，再各种等比弄下算出来吧，原来三角形的直角边是sqrt(2r)，正方形边长是2sqrt(r)/3。
matrush 发表于 2012-5-27 18:34

不对，是不确定

qiushui131UID: 3202204

晕啊， 我也是被这道题给耽搁了时间，不够细致!!！结果发现没有答案，然后继续重蹈覆辙，然后Q悲剧了。。。

m2etuUID: 3014780

题目中有说是等腰三角形的，isosceles，条件不缺。