5.82*x^2-43.2*x+91.72=17
    a+1/a=1
    597*(1-r^11)/(1-r)-597=6617.25
    1.8十X=6
    1.8十X=6
    35x-x＾2＝304
    1.8十X=6
    0.817366x-0.1138016sin(2πx)-0.0976525=0.2122(sin(πx))^3+0.0373sin(πx)+0.0373sin(1.25π-2πx)
    (sin(42.7πsin(x)))/(32sin(1.33πsin(x)))-0.707
    (sin(42.7πsin(x)))/(32sin(1.33πsin(x)))-0.707
    (sin(42.7πsin(x)))/(32sin(1.33πsin(x)))
    0.5438x^3-1.5291x^2+1.9844x-0.18192=0
    45x+3x+96 =0
    5x+3x=8
    80-（10-X）÷3=77
    a^2(a^2+1)=400
    ln［(x＋2）/（1-x）］
    ln［(x＋2）/（1-x）］
    1.0875x-0.1464sin(2πx)-0.140625=0.2122(sin(πx))^3+0.043sin(πx)+0.043sin(1.25π-2πx)
    y=560+0.8y

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