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Solve[{-6 lx^2 (x - Subscript[lx, 1])^2 +
    12 lx (x - Subscript[lx, 1])^2 Subscript[lx, 1] -
    4 x^3 Subscript[lx, 2] +
    12 lx (x - Subscript[lx, 1])^2 Subscript[lx, 2] + 4
\!\(\*SubsuperscriptBox[\(lx\), \(1\), \(3\)]\) Subscript[lx, 2] +
    2 lx^2
\!\(\*SubsuperscriptBox[\(lx\), \(2\), \(2\)]\) -
    4 lx Subscript[lx, 1]
\!\(\*SubsuperscriptBox[\(lx\), \(2\), \(2\)]\) + 6
\!\(\*SubsuperscriptBox[\(lx\), \(1\), \(2\)]\)
\!\(\*SubsuperscriptBox[\(lx\), \(2\), \(2\)]\) - 4 lx
\!\(\*SubsuperscriptBox[\(lx\), \(2\), \(3\)]\) + 4 Subscript[lx, 1]
\!\(\*SubsuperscriptBox[\(lx\), \(2\), \(3\)]\) +
\!\(\*SubsuperscriptBox[\(lx\), \(2\), \(4\)]\) == 0,
  0 < Subscript[lx, 1] < x < Subscript[lx, 1] + Subscript[lx, 2] <
   lx}, x, Reals]
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CODE:
<< Notation`

Symbolize[ParsedBoxWrapper[\(lx \_ _\)]](*ÕâÐÐÓÃÏàÓ¦µÄÃæ°åÊäÈë»á±È½ÏºÃ¿´£¬¾ßÌå¿´¿´°ïÖú*)

Solve[{-6*lx^2*(x - Subscript[lx, 1])^2 +
    12*lx*(x - Subscript[lx, 1])^2*Subscript[lx, 1] - 4*x^3*Subscript[lx, 2] +
         12*lx*(x - Subscript[lx, 1])^2*Subscript[lx, 2] +
    4*Subscript[lx, 1]^3*Subscript[lx, 2] + 2*lx^2*Subscript[lx, 2]^2 -
         4*lx*Subscript[lx, 1]*Subscript[lx, 2]^2 +
    6*Subscript[lx, 1]^2*Subscript[lx, 2]^2 - 4*lx*Subscript[lx, 2]^3 +
         4*Subscript[lx, 1]*Subscript[lx, 2]^3 + Subscript[lx, 2]^4 == 0,
  0 < Subscript[lx, 1] < x < Subscript[lx, 1] + Subscript[lx, 2] < lx}, x, Reals]

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2Â¥: Originally posted by xzczd at 2016-01-08 00:25:38
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<< Notation`

Symbolize(*ÕâÐÐÓÃÏàÓ¦µÄÃæ°åÊäÈë»á±È½ÏºÃ¿´£¬¾ßÌå¿´¿´°ïÖú*)

Solve


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fx[x_, i_] := -qx*f[x] + \!\(
\*UnderoverscriptBox[\(\[Sum]\), \(u = 1\), \(i\)]\((
\*SubscriptBox[\(rx\), \(u\)]*
\*SuperscriptBox[\(f[x -
\*UnderoverscriptBox[\(\[Sum]\), \(v = 1\), \(u\)]
\*SubscriptBox[\(lx\), \(v\)]]\), \(0\)])\)\)
3Â¥2016-01-08 10:42:56
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xzczd

ľ³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
3Â¥: Originally posted by Çàɳɽ at 2016-01-08 10:42:56
лл£¬Ð¡°×±íʾÈÔÈ»²»¶®ÄØ£¡

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fx := -q ...

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CODE:
fx[x_, i_] := (-qx)*f[x] + Sum[ru[u]*f[x - Sum[lv[v], {v, 1, u}]]^0,
       {u, 1, i}]

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