x^3+20x^2+20x=1000
    X^2-390/9+129=0
    xxx+20xx+20x=1000
    （t^2+12t+36)*0.271*(3+2/3t)-t^2*3.690*(5+2/3t)=0
    （0.28x-0.001）/(0.31-x）/（0.7-x）=ln（（0.11-x）*（0.11-x）/（0.15-x）/(0.2-x)）
    x^2/(sinx)^2=4/162.7
    u^2/(sinu)^2=4/162.7
    (3-x)^2=4((3-x)^2-42)
    4880*0.8=(1+1/9)x
    （X-2)^2+121=169/4
    -m^(2)-2m+3=3
    20*lg(10/(x*(0.2*x+1)*(0.5*x+1)))=-11.28
    x^3-14x^2+50x-13=0
    ln(7.7*0.0001*t)=-(50000-0.1*t)^2/40/t
    log(e)^(7.7*0.0001*t)=-(50000-0.1*t)^2/40/t
    20*lg(16/(x*(x+1)*(0.01*x+1)))=-8.18
    20*lg(16/(x*(x+1)*(0.01*x+1)))=8.18
    20*lg(16/(x*(x+1)*(0.01*x+1)))=20
    20*lg(x)=20
    logA＝2.031

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