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这个方程要怎么解才对?急!!! f[v2_, c_, \[Lambda]_] = -41.01562499*\[Lambda]*[[1/2]* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] + 2*\[Lambda]^2] + \[Lambda]]*[18.9276912*v2*\[Lambda]^2 + 13.32936000*v2* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] + 2*\[Lambda]^2]*\[Lambda] - 0.1492888320*10^-3*v2*\[Lambda]^3 - 0.7464441600*10^-4*v2*\[Lambda]^2* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] + 2*\[Lambda]^2] + 92639.54586*\[Lambda]^3*c + .5595428570*\[Lambda]^3* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] - 2*\[Lambda]^2]]/[[[1/2]* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] + 2*\[Lambda]^2] + \[Lambda]]^2 + [1/2]* sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] - [1/ 2]*\[Lambda]^2] + 20.50781250*\[Lambda]* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] - 2*\[Lambda]^2]*[-96.66282064*v2^2*\[Lambda]^2 - 1.566861854*10^6*v2*\[Lambda]*c - 13.32936000*v2* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] - 2*\[Lambda]^2]*\[Lambda] + 12.35834702*v2*\[Lambda]^2*c + 0.7464441600*10^-4*v2*\[Lambda]^2* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] - 2*\[Lambda]^2] + 1.119085714*\[Lambda]^4 + .5595428570*\[Lambda]^3* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] + 2*\[Lambda]^2]]/[[[1/2]* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] + 2*\[Lambda]^2] + \[Lambda]]^2 + [1/2]* sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] - [1/ 2]*\[Lambda]^2] g[v2_, c_, \[Lambda]_] = -20.50781250*\[Lambda]* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] - 2*\[Lambda]^2]*[18.9276912*v2*\[Lambda]^2 + 13.32936000*v2* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] + 2*\[Lambda]^2]*\[Lambda] - 0.1492888320*10^-3*v2*\[Lambda]^3 - 0.7464441600*10^-4*v2*\[Lambda]^2* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] + 2*\[Lambda]^2] + 92639.54586*\[Lambda]^3*c + .5595428570*\[Lambda]^3* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] - 2*\[Lambda]^2]]/[[[1/2]* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] + 2*\[Lambda]^2] + v2]^2 + [1/2]* sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] - [1/ 2]*\[Lambda]^2] - 41.01562499*\[Lambda]*[[1/2]* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] + 2*\[Lambda]^2] + \[Lambda]]*[-96.66282064*v2^2*\[Lambda]^2 - 1.566861854*10^6*v2*\[Lambda]*c - 13.32936000*v2* sqrt[ 2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] - 2*\[Lambda]^2]*\[Lambda] + 12.35834702*v2*\[Lambda]^2*c + 0.7464441600*10^-4*v2*\[Lambda]^2* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] - 2*\[Lambda]^2] + 1.119085714*\[Lambda]^4 + .5595428570*\[Lambda]^3* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] + 2*\[Lambda]^2]]/[[[1/2]* sqrt[2*sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] + 2*\[Lambda]^2] + \[Lambda]]^2 + [1/2]* sqrt[\[Lambda]^4 + 6.852769615*10^9*\[Lambda]^2*c^2] - [1/ 2]*\[Lambda]^2] Solve[{f[v2_, c_, \[Lambda]_] == 0, g[v2_, c_, \[Lambda]_] == 0}, {v2, c, \[Lambda]}] 错误提示:Solve::ivar: 1 is not a valid variable. 这是个两个方程三个未知数,三元多次的方程组,我最终目的想要求出v2关于lambda的函数表达式或曲线、c关于lambda的表达式或曲线。 方程组来源:一个热应力的系统矩阵,行列式为零后,分离实部虚部,实部=0,虚部=0。 求求大神帮下忙,不然我要跪了……
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