（e^x）=-（e/x）
    （e^x）=-（e/x）
    （e^x）=-（e/x）
    （e^x）=-（e/x）
    x（e^x）=-e
    e+x（e^x）
    e+xe^x
    e+xex
    10.714*0.2/(10.714−x)+4.762*0.3/(4.762−x)+1.571*0.1/(1.571-x)+0.4/(1-x)=0
    x-x/1.05*0.12=35000
    0.45/(2.25−x)+0.03/(1−x)+0.033/(0.33-x)+0.084/(0.21-x)=0
    4s^3+15s^2+18s+5=0
    0.45/(2.25−x)+0.03/(1−x)+0.033/(0.33-x)+0.084/(0.21-x)=0
    5000*（300-y-25)+25*（300-y-50)^2/2=50*250*（y-25）+25*（y-50）^2/2
    0.45/(2.25−x)+0.03/(1−x)+0.033/(0.33-x)+0.084/(0.21-x)=1
    x-x/(1+0.05)*0.12=35000
    2s^3+12s^2+17s+5=0
    x-x/(1+5%)*12%=35000
    x-x/(1+5%)*12%=35000
    x*12%-(1-x)*20%=0

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