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>Hello teacher~
>
>Suppose not all four integers a, b, c, d are]]> Feb 2, 2013 11:33:03 PM Feb 2, 2013 11:33:03 PM mina_world@hanmail.net 0 http://mathforum.org/kb/thread.jspa?messageID=8233118&tstart=0#8233118 >
>Hello teacher~
>
>Suppose not all four integers a, b, c, d are]]> Feb 2, 2013 7:43:24 AM Feb 2, 2013 7:43:24 AM quasi@null.set 1 http://mathforum.org/kb/thread.jspa?messageID=8231413&tstart=0#8231413
Suppose not all four integers a, b, c, d are equal.
Start with (a, b, c, d) and repeatedly replace (a, b, c, d)
by (a-b,]]> Feb 2, 2013 5:26:36 AM Feb 2, 2013 5:26:36 AM mina_world@hanmail.net 2