mathematica计算积分为什么算不出来a := 0.9var := 0.085760932176f[x_] := 1/0.140529615*Integrate[\!\(TraditionalForm\`\*SuperscriptBox["e", RowBox[{"\[Minus]", FractionBox[SuperscriptBox[RowBox[{StyleBox["(",SpanMinSize->1,SpanMaxSize->1], R

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