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mdl520

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Mr__Right

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mdl520: ½ð±Ò+1, ¡ïÓаïÖú 2015-05-06 22:46:55
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Solve[{x^2==1,x>0},x]

Ö»Êä³ö  x->1
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2Â¥2015-05-06 19:44:15
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mdl520

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3Â¥2015-05-06 22:46:50
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walk1997

½ð³æ (ÖøÃûдÊÖ)

ÓÃSelectÓ¦¸Ã±È½ÏÈÝÒ×ÇáËÉʵÏÖ ½¨Ò鏸¸ö¾ßÌåµÄÀý×Ó
4Â¥2015-05-07 12:21:24
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walk1997

½ð³æ (ÖøÃûдÊÖ)

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
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

mdl520

¾èÖú¹ó±ö (ÖøÃûдÊÖ)

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5Â¥: Originally posted by walk1997 at 2015-05-07 12:29:39
ÌáÈ¡xÈÎÒ⣬Re>0µÄ½â

result = NSolve
Select[result, MemberQ &]

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}]
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