【数学讨论稿】鳩耳耳数学讨论稿201-300

siling5440

218我觉得是，N的20次方后四位是0，求n的最小值，然而，我依然不会做

Penspinner

siling5440 发表于 2015-9-28 17:02
所以 ratio of volume = (ratio of length)^3=1.2，ratio of length不是应该=1.2开三次根么？ ...

B的dimensions比A多20% -> For the word dimension, I interpret it as 1D rather than 3D. If it was 3D, 狗主/Question would mention "Volume" instead

Penspinner

siling5440 发表于 2015-9-28 17:06
218我觉得是，N的20次方后四位是0，求n的最小值，然而，我依然不会做

N*20^K? or N^20? What an ambiguity......

That's why I don't know how to do this question

siling5440

Penspinner 发表于 2015-9-28 17:09
N*20^K? or N^20? What an ambiguity......

That's why I don't know how to do this question

N^20后四位是0，求n的最小值，跪舔楼主大神求解

siling5440

Penspinner 发表于 2015-9-28 17:06
B的dimensions比A多20% -> For the word dimension, I interpret it as 1D rather than 3D. If it was 3D, ...

膜拜楼主大神

Penspinner

siling5440 发表于 2015-9-28 17:14
膜拜楼主大神

FYI, in this question, dimensions should refer to Length/Width/Height of the rectangular

sky星星在唱歌

谢谢楼主！！！不过210我觉得A/B/E都可以啊

Penspinner

siling5440 发表于 2015-9-28 17:13
N^20后四位是0，求n的最小值，跪舔楼主大神求解

0 or 10. 0^20=000000000, but those 0 tens, hundreds and thousands digit are not significant
10^20<<< this one is trivial.
Also, the question did not mention whether N should be a positive number. If not, this question would not have a solution

So you need to consider this ambiguity during the exam.

For any number of which unit digit is 1-9, whatever the index is, the N^20 would not have a unit digit 0

Penspinner

sky星星在唱歌 发表于 2015-9-28 17:24
谢谢楼主！！！不过210我觉得A/B/E都可以啊

For B, if x=1, y=1/2. Epic Fail

sky星星在唱歌

求问楼主215题是啥意思……x、y和r的关系是怎样的也没给出啊，而且这是在一个坐标系么……完全摸不清头脑啊