返回空值。。。。怎么办？

wypjyq

M(T)=Inf-271168454567635./2251799813685248.*i.*erf(4319490844306979./2251799813685248.*i.*T-8171018849268851./281474976710656.*i)
solve('2*M(2*T-5)-M(T-5)+8*T*(1/(sqrt(2)*2.7128))*exp((2*T-5-15.1333)^2/2*2.7128^2-T*(1/(sqrt(2)*2.7128))*exp((*T-5-15.1333)^2/2*2.7128^2=0',T)
' u' v! r& Y' W/ \6 L& n9 t$ V2 j9 [Warning: Empty equation
> In dsolve at 81
% m  g3 u0 t  y4 X. M
2 r0 Y/ d1 K3 I0 |( l) Cans =
' x& D; B( s* D/ W1 c
# Q1 h( l- I6 a# q; r[ empty sym ]

杨帆

谢谢分享。。。