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walk1997
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4Â¥2015-05-07 12:21:24
Mr__Right
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2Â¥2015-05-06 19:44:15
walk1997
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ÌáÈ¡xÈÎÒ⣬Re[y]>0µÄ½â result = NSolve[{x^3 + y^3 + 4 x*y == 10, y^3 + x^3 + x*y == 30}, {x, y}] Select[result, MemberQ[#, (y -> t2_ /; Re[t2] > 0)] &] |
5Â¥2015-05-07 12:29:39
mdl520
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Result = Solve[{d e/(1 - (f)^2) == a b/(1 - (c)^2), a b d/(1 - (a)^2) == f h i/(1 - (i)^2), d f i/(1 - (f)^2) == a b h/(1 - (b)^2), b e/(1 - (h)^2) == a d/(1 - (g)^2), b h i/(1 - (h)^2) == a d f/(1 - (d)^2), (a)^2 + (b)^2 + (c)^2 == 1, (d)^2 + (e)^2 + (f)^2 == 1, (g)^2 + (h)^2 + (i)^2 == 1, (a)^2 + (d)^2 + (g)^2 == 1, (b)^2 + (e)^2 + (h)^2 == 1, (i)^2 + (f)^2 + (c)^2 == 1}, {a, b, c, d, e, f, g, h, i}] ÒªÇóµ±aΪ0-1ʱ ÆäËûÁ¿µÄ½âµÄȡֵ·¶Î§¶¼ÔÚ0-1µÄ·¶Î§ÄÚÊä³ö Õâ¸öÔõô±à°¡ Çó´óÉñÖ¸µãÒ»¶þ£¿ |
6Â¥2015-05-08 10:11:29













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