## RE : [Mental Calculation] cubic fives

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• Yes indeed , I made a big mistake :-) Emmanuël ... De : MentalCalculation@yahoogroups.com [mailto:MentalCalculation@yahoogroups.com] De la part de A.W.A.P.
Message 1 of 6 , Dec 25, 2007
Yes indeed , I made a big mistake :-)
Emmanuël

-----Message d'origine-----
De : MentalCalculation@yahoogroups.com
[mailto:MentalCalculation@yahoogroups.com] De la part de A.W.A.P. Bouman
Envoyé : mardi 25 décembre 2007 14:46
À : MentalCalculation@yahoogroups.com
Objet : Re: [Mental Calculation] cubic fives

Dear Emmanuël,

I fear there is a misunderstanding: Gert and I found a solution, about
which we wrote. This solution concerns integer roots. I think you made
akind of mistake with your number. If you take 857. 375 and multiply by
8, you get 6.859.000, and the cubic root of is is 190/2=95.

Robert Fountain made the same suggestion. What we wanted is a "direct
solution" and we still think having found one. We do not pretend having
found the only solution and if someone else has another or even better
idea, we would greatly welcome it.

Regards,

Willem Bouman

----- Oorspronkelijk bericht -----
Van: Emmanuël DUBRULLE
Aan: MentalCalculation@ <mailto:MentalCalculation%40yahoogroups.com>
yahoogroups.com
Verzonden: dinsdag 25 december 2007 10:39
Onderwerp: RE : [Mental Calculation] cubic fives

I have an Idea ;
A number multipliyed by 2 gives the cube of a number multiplied by 8

Exemle 875375 by 8 = 7.003.000;
When you multiply cube of number ending in 5 you obtain a number ending
by 3 or 1;

Emmanuël

-----Message d'origine-----
De : MentalCalculation@ <mailto:MentalCalculation%40yahoogroups.com>
yahoogroups.com
[mailto:MentalCalculation@ <mailto:MentalCalculation%40yahoogroups.com>
yahoogroups.com] De la part de Oleg Stepanov
Envoyé : lundi 24 décembre 2007 20:58
À : A.W.A.P. Bouman
Objet : Re: [Mental Calculation] cubic fives

AWAPB> There is a Word document and an Excel file, both named
AWAPB> "the cuboc fives". To understand what we did you need to open
AWAPB> both files.

AWAPB> Until now we did not receive any reaction.

AWAPB> This can be either the explanation is so crystal clear
AWAPB> that no questions have to be asked or you were not yet in the

May be it means that another peoples solve this problems years
ago?
Just supposition.

Sincerely Yours, Oleg Stepanov.
http://stepanov. <http://stepanov. <http://stepanov.lk.net/> lk.net/>
lk.net/

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