英文应用题A square plate of some size is cut at four corners.Equal squares of the same size are cut and is formed as open box.If this open box carries 128 ml of oil.What is the size of the side of the plate?(a) 17 (b) 14 (c) 13(d) None of these

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英文应用题A square plate of some size is cut at four corners.Equal squares of the same size are cut and is formed as open box.If this open box carries 128 ml of oil.What is the size of the side of the plate?(a) 17 (b) 14 (c) 13(d) None of these
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英文应用题A square plate of some size is cut at four corners.Equal squares of the same size are cut and is formed as open box.If this open box carries 128 ml of oil.What is the size of the side of the plate?(a) 17 (b) 14 (c) 13(d) None of these
英文应用题
A square plate of some size is cut at four corners.Equal squares of the
same size are cut and is formed as open box.
If this open box carries 128 ml of oil.What is the size of the side of
the plate?
(a) 17
(b) 14
(c) 13
(d) None of these

英文应用题A square plate of some size is cut at four corners.Equal squares of the same size are cut and is formed as open box.If this open box carries 128 ml of oil.What is the size of the side of the plate?(a) 17 (b) 14 (c) 13(d) None of these
译文:方形(纸)板,四角各切掉相等的正方形,折起来,就是一没有盖的盒子.求原木板边长.
设原长为a,切去边长为b,则(a-b)*(a-b)*b=128.
如果不是以“整数”为前提,貌似没法做啊.
因为a-b>b,故(a-b)^2=164
从而a-b=8,同时b=2,所以a=10.
所以选D.

我是这样理解的:四个角切下四个相同的小的正方形!设个四个正方形的边长为h(即为这个box的高)设余下的这个四边折起,形成一个box(设次box的地面边长为a)即该square plate的边长为L=2h+a
因为体积为128即:haa=128
利用均值不等式:L=2h+(a/2)+(a/2)》3*根号下3次方[2h*(a/2)*(a/2)]=12
所以L》12就可以了

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我是这样理解的:四个角切下四个相同的小的正方形!设个四个正方形的边长为h(即为这个box的高)设余下的这个四边折起,形成一个box(设次box的地面边长为a)即该square plate的边长为L=2h+a
因为体积为128即:haa=128
利用均值不等式:L=2h+(a/2)+(a/2)》3*根号下3次方[2h*(a/2)*(a/2)]=12
所以L》12就可以了
如果不说明要取整数,那么ABC 都可以!

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某个正方形的木板四个角被切下相同的形状,并且刚好形成一个上面开口的箱子。
如果这个开口箱子运载128毫升油。那么这个木板的边长为?
(a) 17
(b) 14
(c) 13
(d)以上都不是
设开口的箱子高为h,底边边长为a
则a^2h=128
当作整数解的话,有:
a=8,h=2或a=4,h=8或a=2,h=32<...

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某个正方形的木板四个角被切下相同的形状,并且刚好形成一个上面开口的箱子。
如果这个开口箱子运载128毫升油。那么这个木板的边长为?
(a) 17
(b) 14
(c) 13
(d)以上都不是
设开口的箱子高为h,底边边长为a
则a^2h=128
当作整数解的话,有:
a=8,h=2或a=4,h=8或a=2,h=32
则木板的边长为a+2h=12或者20或者66
所以选D

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