dy/dx=(3^x)'*(1+e^-x)+3^x*(1+e^-x)'+(ln3x)'
=3^x*ln3*(1+e^-x)+3^x*(-e^-x)+3/3x
=ln3*3^x(1+e^-x)-3^x*e^-x+1/x
设 y=3^x *（1+e^-x)+ln3x 求dy/dx
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