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)
6 J; A. G* F6 i3 MWarning: Empty equation
> In dsolve at 81

! _* i0 `( b' w% \% cans =
/ h& X) r1 k6 N0 a  j5 ]2 N+ }
[ empty sym ]

杨帆

谢谢分享。。。