0.0000001*x^3-0.0030010*x^2+27.2348652*x-82259.5691160
    x^2+81=(15-x)^2
    x=3/7*(2x+9)
    x=3/7*(2x+9)
    x(2x+9)=3/7
    1.82÷（1+0.01x）=1.7
    2732.231×0.028×（40-x）^0.75 = 62.256×0.887×0.488×（x-30）
    x^7+x^4+4x^2+19x-10=0
    2732.231×0.028×（40-x）^0.75 = 87.923×0.887×0.488×（x-30）
    √x
    2732.231×0.028×（40-x）^0.75=66.608×0.887×0.488×（x-30）
    lnx=-1.082
    0.418*{（x-sin（2πx）/2π）+（3x-1.25）*0.141}＝2/3*{（sin(πx）)^3/π}+0.141*594/650*{sin(πx)+sin(1.25π-2πx）}/π
    （m＋√（m＾2＋1））＾m＝10000000000
    sinx=30
    since=30
    sin x=30
    tanx=30
    Rand=30
    0.388*{（x-sin（2πx）/2π）+（3x-1.25）*0.129}＝2/3*{（sin(πx）)^3/π}+0.129*546/600*{sin(πx)+sin(1.25π-2πx）}/π

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