symsABCDEFGHIJKLMNOPQabcdpeq1=['p*M*C-p*B*(2*M+N)-P-b=0'];eq2=['(1-p)*M*G-E*(1-p)*(2*M+N)-Q-c=0'];eq3=['A+p*d-a-p*b*O=0'];eq4=['D-d*(1-p)-a-c*O*(1-p)=0'];eq5=['d-K*I-K*G*(1-p)*(M+N)+2*K*M*E*(1-p)-L*J-L*H*(1-p)*(M+N)+2*L*M*F*(1-p

　　symsABCDEFGHIJKLMNOPQabcdp

　　eq1=['p*M*C-p*B*(2*M+N)-P-b=0'];

　　eq2=['(1-p)*M*G-E*(1-p)*(2*M+N)-Q-c=0'];

　　eq3=['A+p*d-a-p*b*O=0'];

　　eq4=['D-d*(1-p)-a-c*O*(1-p)=0'];

　　eq5=['d-K*I-K*G*(1-p)*(M+N)+2*K*M*E*(1-p)-L*J-L*H*(1-p)*(M+N)+2*L*M*F*(1-p)=0'];

　　[a,b,c,d,p]=solve(eq1,eq2,eq3,eq4,eq5,'a','b','c','d','p');

　　运行出现?Errorusing==>solve>getEqnsat182

　　'A+p*d-a-p*b*O=0'isnotavalidexpressionorequation.

　　检查了很多遍,求指教