设=∫-∞atetdt,则a=________.

admin2019-05-19  47

问题=∫-∞atetdt,则a=________.

选项

答案2

解析
    ∫-∞atet dt=∫-∞atdet =tet|-∞a一∫-∞aet dt=aea—et|-∞a=(a一1)ea
   所以ea=(a一1)ea,a=2.
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