matlab solve global bglobal nglobal yt1=0.1;t2=0.0

matlab solve global bglobal nglobal yt1=0.1;t2=0.0

将前3行全局变量定义global b;global n;global y;改为符号变量定义：syms b n y.希望你的shizi表达式有意义.我的机子求解你的问题一直busy======以下答案可供参考======供参考答案1:没有报错啊，结果是：ans =-((COH0^2*COHadd^2*Kb^4 + 2*COH0^2*COHadd*Kb^3 + 4*COH0^2*Cblg*Kb^3*N1 + 4*COH0^2*Cblg*Kb^3*N2 + 4*COH0^2*Cblg*Kb^3*N3 + 4*COH0^2*Cblg*Kb^3*N4 + 4*COH0^2*Cblg*Kb^3*N5 + 4*COH0^2*Cblg*Kb^3*N6 + 4*COH0^2*Cblg*Kb^3*N7 + COH0^2*Kb^2 + 2*COH0*COHadd^2*Kb^3 - 2*COH0*COHadd*Cblg*Kb^3*N1 - 2*COH0*COHadd*Cblg*Kb^3*N2 - 2*COH0*COHadd*Cblg*Kb^3*N3 - 2*COH0*COHadd*Cblg*Kb^3*N4 - 2*COH0*COHadd*Cblg*Kb^3*N5 - 2*COH0*COHadd*Cblg*Kb^3*N6 - 2*COH0*COHadd*Cblg*Kb^3*N7 + 4*COH0*COHadd*Kb^2 + 6*COH0*Cblg*Kb^2*N1 + 6*COH0*Cblg*Kb^2*N2 + 6*COH0*Cblg*Kb^2*N3 + 6*COH0*Cblg*Kb^2*N4 + 6*COH0*Cblg*Kb^2*N5 + 6*COH0*Cblg*Kb^2*N6 + 6*COH0*Cblg*Kb^2*N7 + 2*COH0*Kb + COHadd^2*Kb^2 - 2*COHadd*Cblg*Kb^2*N1 - 2*COHadd*Cblg*Kb^2*N2 - 2*COHadd*Cblg*Kb^2*N3 - 2*COHadd*Cblg*Kb^2*N4 - 2*COHadd*Cblg*Kb^2*N5 - 2*COHadd*Cblg*Kb^2*N6 - 2*COHadd*Cblg*Kb^2*N7 + 2*COHadd*Kb + Cblg^2*Kb^2*N1^2 + 2*Cblg^2*Kb^2*N1*N2 + 2*Cblg^2*Kb^2*N1*N3 + 2*Cblg^2*Kb^2*N1*N4 + 2*Cblg^2*Kb^2*N1*N5 + 2*Cblg^2*Kb^2*N1*N6 + 2*Cblg^2*Kb^2*N1*N7 + Cblg^2*Kb^2*N2^2 + 2*Cblg^2*Kb^2*N2*N3 + 2*Cblg^2*Kb^2*N2*N4 + 2*Cblg^2*Kb^2*N2*N5 + 2*Cblg^2*Kb^2*N2*N6 + 2*Cblg^2*Kb^2*N2*N7 + Cblg^2*Kb^2*N3^2 + 2*Cblg^2*Kb^2*N3*N4 + 2*Cblg^2*Kb^2*N3*N5 + 2*Cblg^2*Kb^2*N3*N6 + 2*Cblg^2*Kb^2*N3*N7 + Cblg^2*Kb^2*N4^2 + 2*Cblg^2*Kb^2*N4*N5 + 2*Cblg^2*Kb^2*N4*N6 + 2*Cblg^2*Kb^2*N4*N7 + Cblg^2*Kb^2*N5^2 + 2*Cblg^2*Kb^2*N5*N6 + 2*Cblg^2*Kb^2*N5*N7 + Cblg^2*Kb^2*N6^2 + 2*Cblg^2*Kb^2*N6*N7 + Cblg^2*Kb^2*N7^2 + 2*Cblg*Kb*N1 + 2*Cblg*Kb*N2 + 2*Cblg*Kb*N3 + 2*Cblg*Kb*N4 + 2*Cblg*Kb*N5 + 2*Cblg*Kb*N6 + 2*Cblg*Kb*N7 + 1)^(1/2)

这个答案应该是对的