求解如下方程组，MATLAB算不出来怎么办？

limopcb

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请教大神，
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求解如下方程组，九个方程九个未知数，MATLAB算不出来，很奇怪，按道理计算出来应该没问题的。感谢！
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: Z$ H2 Q0 q' yclc;
clear all;
close all;
+ ~" V$ o! C- l" Usyms v1 v2 v4 P3ref
syms i12 i13 i14 i24 i34

4 [: y; r5 U$ a4 g' Q% B; t+ mr = 0.01;   
' R1 X0 X. }8 k( s9 q. v7 Q; _7 QR12 = 75*r; R13 = 125*r; R14 = 200*r; R24 = 150*r; R34 = 175*r;

P1ref = 175e6; P2ref = 35e6; P4ref = 140e6; v3ref = 100e3;
v3 = v3ref;
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eq1 = P1ref/v1 - (i13 + i12 + i14);
9 c# I  g6 b4 z( J" |' O4 Teq2 = P2ref/v2 - (-i12 + i24);
9 u# I* [; o, {/ Q2 Y# L+ Qeq3 = P3ref/v3 - (i13 - i34);
eq4 = P4ref/v4 - (i34 + i14 + i24);
" ^; }! V$ Y& l, }! ]3 Ceq5 = (v1 - v3)/R13 - i13;
7 H8 o; W3 }- Q- o% f8 Z/ Xeq6 = (v1 - v4)/R14 - i14;
: m+ K' W4 T  T3 a- r9 J2 Xeq7 = (v1 - v2)/R12 - i12;
eq8 = (v2 - v4)/R24 - i24;
& T4 i  \9 @) f: n. Heq9 = (v3 - v4)/R34 - i34;

s = solve(eq1,eq2,eq3,eq4,eq5,eq6,eq7,eq8,eq9);

artic

syms v1 v2 v4 P3ref
! n8 b% Z2 v5 w+ `; Y: bsyms i12 i13 i14 i24 i34
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) J  S6 D4 y# z6 c$ \8 P# w9 |/ er = 0.01;   
2 T: A$ u9 J. d1 `9 w: yR12 = 75*r; R13 = 125*r; R14 = 200*r; R24 = 150*r; R34 = 175*r;

& C% w8 K, R5 c& m8 O$ IP1ref = 175e6; P2ref = 35e6; P4ref = 140e6; v3ref = 100e3;
v3 = v3ref;
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eq1 = P1ref/v1 - (i13 + i12 + i14)==0;
1 v3 Q1 I& a  v1 h# G$ q5 feq2 = P2ref/v2 - (-i12 + i24)==0;
( m6 D5 w3 @9 R- e7 g+ `" P4 eeq3 = P3ref/v3 - (i13 - i34)==0;
eq4 = P4ref/v4 - (i34 + i14 + i24)==0;
/ F2 a8 M6 {6 Seq5 = (v1 - v3)/R13 - i13==0;
eq6 = (v1 - v4)/R14 - i14==0;
eq7 = (v1 - v2)/R12 - i12==0;
+ ]; m3 h7 A3 T# aeq8 = (v2 - v4)/R24 - i24==0;
eq9 = (v3 - v4)/R34 - i34==0;
, W1 Y  f' b, Teqns=[eq1,eq2,eq3,eq4,eq5,eq6,eq7,eq8,eq9]
vars=[v1,v2,v4,P3ref,i12,i13,i14,i24,i34]
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s = vpasolve(eqns,vars)

House

数值解试试：
, A& j  S! @; l5 Uv1: 101005.230297198
i13: 804.184237758687
2 T/ ]' J9 [& }  F4 B% Z/ qi12: 314.30767957579
5 p( t* `! z! E8 |) Ni14: 614.09162794411
v2: 100769.499537517
i24: 661.634997470918
p3ref: 67678254.7078767
i34: 127.40169067992
( B, `! w  J! s0 t. O% zv4: 99777.0470413101