381.15e^(−0.231x)−228.69e^(−0.1386x)=0
    −88.04565e^(−0.231x)+31.696434e^(−0.1386x)=0
    tan（x/2）=1.54/2/0.85
    x/(x+130)=0.78
    7x*x-6x=12
    x*x*x-2=0
    sinx=1+x
    （x-1/x）^2=3996
    56+x=97
    x^2-35x-2750=0
    x^2-35x-750=0
    660.7/[（1.2+1.15x）(2+1.15x)]+3.5x=61.75
    660.7/[（1.2+1.15x）(2+1.15x)+3.5x=61.75
    sin(x)+x=sqrt(4-x^2)
    x=3*(10^-19)/887.22053*6.022*10^23
    x=6*(10^-18)/887.22053*6.022*10^23
    0.5=0.25143×exp(-x÷63.82535)+0.25143×exp(-x÷70.91705)+0.25143×exp(-x÷78.00876)
    x-1/x=104.92
    x/arctanx
    -y^4+4y^3-4y^2-y+1=0

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