470x/(470+x) = 380
    xsin(877/2*x)=435
    x=14
    x=27
    1+COSx
    2^x=x^2
    -1/2x^2+3/2x=0
    a^2+3a=4
    3（2-x/2-x/6）+2x
    0.168=0.137Z^-3+0.119Z^-2+0.269Z^-1-0.019
    0.129=0.137Z^-3+0.119Z^-2+0.269Z^-1-0.019
    0.434=0.137Z^-3+0.119Z^-2+0.269Z^-1-0.019
    （x-200-300）×0.75-55/100=(x-200)×0.75-55/200
    （x-500）/100=(x-200)/200
    x^3-4×x^2+（5/2）×x-6=0
    x3-4×x2+（5/2）×x-6=0
    （300/x-1）×(x+10)=300
    10+x=3000/x
    2^x=90
    3.9852=（（28.02*0.639（x+0.1））/（1+0.639（x+0.1））*（（100-6.66-1.14）/100）*（1/(1+0.31*1.14）+（（0.76（x+0.1））/（1.3*0.101325））

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