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A maths problem [Copy link] 中文

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Post time 2007-2-27 21:53:34 |Display all floors
The lengths of all edges of a tetrahedron are integers.the lenghts of five of the edges are 14,20,40,52,70,the number of possible lengths for the sixth edge is ???
                                                                                        ——2002 Canadian Mathmetics Competition(Grade 11)


This is the last problem, It seems that maths competiton in Canada is much easier than it is in China.
I'm a newcomer.

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Post time 2007-3-1 21:54:00 |Display all floors

it is too hard for me?

I thinkde it all night,but i can't make out it,actually,i forgot maths ,because i had graduated for 20 years

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Post time 2007-3-1 23:44:36 |Display all floors
find out China's world position, year by year, inside this website:

http://tinyurl.com/2ayqyx

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Post time 2007-3-2 13:20:58 |Display all floors

I thought

I said 6 yesterday

was I deleted (to give others a chance)

or is this a thread with a twin?


:)
"We know it's weakness, but the weakness is so strong!"

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Post time 2007-3-3 19:23:27 |Display all floors
You are right. The answer is 6.
I met a problem when posting this thread. I posted for several times but it couldn't be seen, but I found it the next day. I don't know if your response is lost.
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Post time 2007-3-26 11:32:03 |Display all floors
there is not "s" in math

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Post time 2007-3-27 17:54:37 |Display all floors
there is not "s" in math


That's right.

But there IS an "s" in "maths".

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