df/dx = -a*e^(-x)+e^x = 0 when x =3/2
then a = e^3
f(x)=e^x+e^3/(e^x)
f(3/2)=e^(3/2)+e^3/(e^(3/2))=2e^(3/2)
横坐标 2e^(3/2)
df/dx = -a*e^(-x)+e^x = 0 when x =3/2
then a = e^3
f(x)=e^x+e^3/(e^x)
f(3/2)=e^(3/2)+e^3/(e^(3/2))=2e^(3/2)
横坐标 2e^(3/2) 不知道对不随
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