【数学讨论稿】鳩耳耳数学讨论稿201-300

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_Ashley 发表于 2015-9-29 15:11
247题  原式应该分解为（p^2+q^2)(p-q)(p+q)  条件1如果给出的是P+Q是偶 那原式一定是偶；虽然狗主给了答案 ...

Sorry for making some mistakes because I published this in rush. You can see that I did make some stupid mistakes. X_X This is my first time to publish Quant JJ. I just want to publish this asap to help as many CDers as possible. Sorry for those stupid mistakes.

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huanerscd 发表于 2015-9-30 02:42
你好，辛苦了！想问一下211题。有没有可能需要确定一下年份是不是闰年。当年一般情况不会，因为美国也是四 ...

No, because it doesn't really matter if there are 365 or 366 days in one year. The question is asking which day in the week but not in the month.

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siling5440 发表于 2015-9-29 15:40
241题，Less than 和more than , 是>-8,

Yes 己修正，忙中看漏了...

机智的大猴子

colourlove1 发表于 2015-9-29 19:47
dimensional concept具体是什么可以解释下吗粤语可以看得懂

我理解是体积大于20%，则大长方形每条边为1.2*1.2*1.2，小长方形为1*1*1

dominoy

感谢分享！               

栗子0917

204 构筑说的是面积B比A多20%，所以B的长和宽都应该是A的长宽的根号下120倍啊 所以周长也应该是B＝A根号下120

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栗子0917 发表于 2015-9-30 10:30
204 构筑说的是面积B比A多20%，所以B的长和宽都应该是A的长宽的根号下120倍啊 所以周长也应该是B＝A根号下1 ...

I think the word dimension should refer to length. I have done Math in English since primary school but I haven't heard that dimension means area or volume... Let's have an example: the dimensions of new iPhone are its height, width and length but not the volume or area. You can easily check this in Apple's website. I think Apple won't make a mistake like this for many years

徐麒翔

241，问h－k的范围。难道范围不应该是最小值到最大值吗？最小值也就是－21.最大值也就是21

徐麒翔

替同学放一只狗：5*5方阵，选三人，要求三人不在同一行也不在同一列。共多少种？

kishi6

204看的不是很明白

有rectangular A和B，B的dimensions比A多20%（好像A和B的长宽高比是一样的，但是给没给A的长宽高比例忘记了），求问B的VOLUMEperimeter和比A多多少

Solution
For Volume: (1.2)^3-1=72.8%
For Perimeter: 20%

如果是A,B长宽高比一样，dimensions这里是表面积吧？1.2^3是什么意思？感觉这样解不对？