0.0256*2*(0.24/0.0256-x)=(20*6.02*10^23/3.14/0.72*10^9)^0.5*(e^(x/2)-e^(-x/2))/2*1.6/10^19
    x-(x/1.01*0.01)-{（x-(x/1.01*0.01)）*0.8-(x/1.01*0.01*0.07/2)}*0.2-(x/1.01*0.01*0.07/2)=10000
    x-(x/1.01*0.01)-(x/1.01*0.01*0.07/2)-{x-(x/1.01*0.01)-(x/1.01*0.01*0.07/2)}*0.16=10000
    (150.5+177.5)/30*x+263/30*(x+15)+120/30(x+30)=1017
    0.0256*2*(0.6/0.0256-x)=(20/3.14/0.72*10^9)^0.5*(e^(x/2)-e^(-x/2))/2*1.6/10^19
    0.0256*2*(0.24/0.0256-x)=(20/3.14/0.72*10^9)^0.5*(e^(x/2)-e^(-x/2))/2*1.6/10^19
    0.0256*2*(0.24/0.0256-x)=(20/3.14/0.72*10^9)^0.5*(e(x/2)-e(-x/2))/20*1.6/10^19
    0.0256*2*(0.24/0.0256-x)=(20/3.14/0.72*10^9)^0.5*(e(x/2)-e(-x/2))/2*1.6/10^19
    0.0256*2*(0.24/0.0256-x)=(20/3.14/0.72*10^9)^0.5*(e(x/2)-e(-x/2))*1.6/10^19
    420*X+270*X=193240.8
    tanx=3
    tanx=1/3
    0.3093-0.156288/x = 10800/1000000
    1=（4%+1）*（x+1)
    20*96485*(exp(0.5/0.0257-x+2)-exp(-0.5/0.0257+x+2))=0.0257*x*(120000000+100000*x*x)
    (150+268.5)/30*x+164/30*(x+15)+120/30(x+30)=620
    3^x=x^9
    3x^-7x-20=0
    3x^2-7x-20=0
    8.3335*x/(1-8.3335x)=30%

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