0.4÷18*13=X
    2xx+4x-1=0
    x=cosx
    arctanx+arctan0.05x=90
    arctan（0.2x）+arctan（0.02x）=90
    arctan0.2x+arctan0.02x=90
    arctan0.2x+arctan0.02x=90
    ((4-x)√8x*√(2-x))/(8-3x)
    509.4*(tan arccos 0.76-tan arccos 0.92)kvar
    arctanx=45
    x^2-3x+1.382=0
    x^2-3x+1=0
    10x^2-21x+10=0
    B×B+B＝600
    285600*X=289665.98
    inv16.14
    3(x-18)=135
    0.0256*0.2*(1.2/2/0.0256-x)=(1200*6.02*10^23/3.14/0.72*10^9)^0.5*(e^(x/2)-e^(-x/2))/2*1.6/10^19
    0.0256*0.1*(1.2/2/0.0256-x)=(1200*6.02*10^23/3.14/0.72*10^9)^0.5*(e^(x/2)-e^(-x/2))/2*1.6/10^19
    0.0256*0.1*(0.24/2/0.0256-x)=(1200*6.02*10^23/3.14/0.72*10^9)^0.5*(e^(x/2)-e^(-x/2))/2*1.6/10^19

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