返回空值。。。。怎么办？

wypjyq

M(T)=Inf-271168454567635./2251799813685248.*i.*erf(4319490844306979./2251799813685248.*i.*T-8171018849268851./281474976710656.*i)
% A6 }7 g: F% W7 z% B4 [. W9 T: tsolve('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)
% W3 h6 J. E  ?9 {! C/ k/ A! uWarning: Empty equation
3 h5 A% t3 k* C  F2 e> In dsolve at 81

ans =
1 G  Y/ c3 H& Y
+ T; h/ ~  y  n9 i  s$ e- P[ empty sym ]

杨帆

谢谢分享。。。