19.26cosx=12
    x(62-2x)=300
    (100-2x)*(50-2x)=3600
    -0.05x²-0.2x-3=0
    -0.05x*x-0.2x-3=0
    x^2-x=240
    x^3 - x^2 - 1 = 0
    cos2πx
    （632+a）÷(236-a)=3
    x^2＝0.196x+0.000324
    0.06*x-0.3653*x^0.9=50880
    cscx+x^2=0
    lnx-x+e=0
    lnx-x+2=0
    X-0.1/0.14-0.1=0-100/-150-100
    x×x/（0.2-x）（0.8-x）=1
    x×x/（0.4-x）（0.8-x）=1.0
    （2.7922*0.2^2-2.492376978*0.2+1/0.996*0.81x/178.2400139)^2.4+(0.8x/174.9371661)^2=1
    （2.7922*0.2^2-2.492376978*0.2+1/0.996*0.81x/189.2400139)^2.4+(0.8x/162.9371661)^2=1
    （2.7922*0.2^2-2.492376978*0.2+1/0.996*0.81x/179.98)^2.4+(0.8x/164.83)^2=1

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