藉風說雨 发表于 2015-12-28 22:35 
你可以去用mathematica软件去求解,我记得里面是可以做符号运算的
事实上你用mathemtica来算结果也一样:
Solve[{fs + 2 c nb1 - nb1 pb1 - nb1 ps1 + 2 ns1 ts == 0,
fb + 2 c ns1 - ns1 pb1 - ns1 ps1 + 2 nb1 tb ==
0, -2 c - fs + 2 c nb1 + pb2 - nb1 pb2 + ps2 - nb1 ps2 - 2 ts +
2 ns1 ts ==
0, -2 c - fb + 2 c ns1 + pb2 - ns1 pb2 + ps2 - ns1 ps2 - 2 tb +
2 nb1 tb == 0}, {pb1, pb2, ps1, ps2}]
still no explicit solution
