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(转)5.27一道很怪的数学题

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发表于 2012-5-27 22:03:44 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
今天考场有一道题目是:

正方形内切于一个直角三角形,该三角形面积为r,求正方形的面积


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
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 our 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:
' 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(
weaken or strengthen the argument.
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沙发
发表于 2012-5-27 22:08:35 | 只看该作者
此三角形好像是等腰,设正方形边长为a,其他各边可推得
板凳
发表于 2012-5-27 22:48:11 | 只看该作者
九分之一
地板
发表于 2012-5-27 23:02:09 | 只看该作者
亲 我的题目是这个 但是 问的是左下角三角形的面积
5#
发表于 2012-5-28 00:43:37 | 只看该作者
亲 我的题目是这个 但是 问的是左下角三角形的面积
-- by 会员 潘哥 (2012/5/27 23:02:09)



是啊是啊 r是正方形的面积吧~~反正我当时懵了没做出来- -
6#
发表于 2012-5-28 02:07:28 | 只看该作者
2/9吧亲。。。
7#
发表于 2012-5-28 08:34:52 | 只看该作者
直角三角形是等腰的,r是三角形的面积,问的是左下角的小三角形的面积,答案是2/9。
8#
发表于 2012-5-28 09:04:12 | 只看该作者
2/9,不用按它给的三角面积求,自己设正方形边长为√2a,其他的边就很好算了,结果也就很明显了
9#
发表于 2012-5-28 13:01:31 | 只看该作者
说明要淡定
10#
发表于 2012-5-28 13:24:59 | 只看该作者
这样一画就清楚了嘛:
[attachimg]101411[/attachimg]

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