zxh999
2009-09-27, 12:45
如题，方程如下：
-s^2*x^7+3*b^2*s^2*x^5+(4*b*c*d*e-3*b^4*s^2)*x^3+6*a*b*d^2*x^2+(b^6*s^2-4*b^3*c*d*e)*x+2*a*b^3*d^2=0
%运行>> syms a b c d e s x ;simple(solve('-s^2*x^7+3*b^2*s^2*x^5+(4*b*c*d*e-3*b^4*s^2)*x^3+6*a*b*d^2*x^2+(b^6*s^2-4*b^3*c*d*e)*x+2*a*b^3*d^2','x'))
??? Error using ==> solve
Unable to find closed form solution.
若运行syms a b c d e s x ;maple('solve(-s^2*x^7+3*b^2*s^2*x^5+(4*b*c*d*e-3*b^4*s^2)*x^3+6*a*b*d^2*x^2+(b^6*s^2-4*b^3*c*d*e)*x+2*a*b^3*d^2),x')
能求出参数的x表达的解，但没有x的参数表达的解。
急着控制建模用，求热心人给予帮助！
-s^2*x^7+3*b^2*s^2*x^5+(4*b*c*d*e-3*b^4*s^2)*x^3+6*a*b*d^2*x^2+(b^6*s^2-4*b^3*c*d*e)*x+2*a*b^3*d^2=0
%运行>> syms a b c d e s x ;simple(solve('-s^2*x^7+3*b^2*s^2*x^5+(4*b*c*d*e-3*b^4*s^2)*x^3+6*a*b*d^2*x^2+(b^6*s^2-4*b^3*c*d*e)*x+2*a*b^3*d^2','x'))
??? Error using ==> solve
Unable to find closed form solution.
若运行syms a b c d e s x ;maple('solve(-s^2*x^7+3*b^2*s^2*x^5+(4*b*c*d*e-3*b^4*s^2)*x^3+6*a*b*d^2*x^2+(b^6*s^2-4*b^3*c*d*e)*x+2*a*b^3*d^2),x')
能求出参数的x表达的解，但没有x的参数表达的解。
急着控制建模用，求热心人给予帮助！