14/03/11 19:58:57.97
>>519 の補足
s(ss-3t) +3u = a+b+c = -1/2,
ttt -3stu +3uu = ab+bc+ca = -1/2,
u = (abc)^(1/3) = 1/2,
より
sssu - ttt = 1/4,
したがって
sss = [5 - 3･7^(1/3)]/2,
ttt = [4 - 3･7^(1/3)]/4,
14/03/11 19:58:57.97
>>519 の補足
s(ss-3t) +3u = a+b+c = -1/2,
ttt -3stu +3uu = ab+bc+ca = -1/2,
u = (abc)^(1/3) = 1/2,
より
sssu - ttt = 1/4,
したがって
sss = [5 - 3･7^(1/3)]/2,
ttt = [4 - 3･7^(1/3)]/4,