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标题: 请问怎样理解这道题的题意。谢谢! [打印本页]

作者: maryland    时间: 2002-9-25 16:14     标题: 请问怎样理解这道题的题意。谢谢!

A tailor trims 4 feet from opposite edges of a square piece of cloth, and 5 feet from the other two edges. If 120 square feet of cloth remain, what was the length of a side of the original piece of cloth?

请问:这里的4feet和5feet都是怎么trim的? 如果能有效果图更好了。:)按照我的理解我没法算出它的答案20。
作者: brigittew    时间: 2002-9-25 17:05

[upload=jpg]uploadImages/20029251722146353.jpg[/upload]
my method (x-4)*(x-5)=120-> x^2-9x +20 -120=0--> x=10
作者: tongxun    时间: 2002-9-25 17:20

20算不出来。(x-4)(x-5)=120。
作者: xulingyan    时间: 2002-9-25 19:09

问题是把X=10代进去验证不对啊
作者: maryland    时间: 2002-9-25 21:31     标题: 谢谢大家的回复!

可是按照(x-4)(x-5)=120算,x也不等于10啊,而应该是介于15到16之间,但是答案全都是整数。我想我们在理解题意上是不是和ETS有些出入呢?
作者: brigittew    时间: 2002-9-25 22:37     标题: 我对题目的重新理解

[upload=jpg]uploadImages/200292522355524224.jpg[/upload]
(x-8)*(x-10)=120--->x=20
作者: tongxun    时间: 2002-9-25 23:29

yes, you are right. Because it is "4 feet from opposite edges ". the most important word I had missed is " edges"!
thanks.
作者: maryland    时间: 2002-9-26 09:35

I got it,too.
brigittew, thanks a lot! ^^




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