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标题: 疑惑 [打印本页]

作者: yvonnezenith    时间: 2003-1-23 12:29     标题: 疑惑

请问,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?
答案:20
谁能告诉我究竟是怎么剪的?
作者: lisaislisa    时间: 2003-1-23 21:14

the fomula is (x-2*4)(x-2*5)=120
x=20

but firstly I thought i would be (x-4)(x-5)=120
your idea ?

^^
作者: elling    时间: 2003-1-24 05:02     标题: lisailisa

为什么要用4*2,5*2?想不通呀?
作者: yvonnezenith    时间: 2003-1-27 10:52

还是不明白这个图形到底怎么剪的。:(
作者: redli    时间: 2003-1-27 11:52

设想一个“回”字,里面的“口”是REMAIN, 外面的是“ORIGIN”
作者: yvonnezenith    时间: 2003-1-27 12:12

嚯嚯,明白了。好形象啊。原来edge指的是边。一直以为是角。




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