为什么会出错啊？

[yinjiangming]

?clear
?solve('a*x^2+b*x+c')
??? Error using ==> maple
at offset 7, `]` unexpected

Error in ==> D:\新\学习\matlab\MATLAB\toolbox\symbolic\@sym\findsym.m
On line 45 ==> v = maple(['sort(',v,',lexorder)']);

Error in ==> D:\新\学习\matlab\MATLAB\toolbox\symbolic\solve.m
On line 97 ==> vars = ['[' findsym(sym(eqns),neqns) ']'];

?solve('x-3=7')
??? Error using ==> maple
at offset 7, `]` unexpected

Error in ==> D:\新\学习\matlab\MATLAB\toolbox\symbolic\@sym\findsym.m
On line 45 ==> v = maple(['sort(',v,',lexorder)']);

Error in ==> D:\新\学习\matlab\MATLAB\toolbox\symbolic\solve.m
On line 97 ==> vars = ['[' findsym(sym(eqns),neqns) ']'];

?