510.52/(12827-X)=0.1
    510.52/(12827-X)=0.1
    133.42*x^3-255.86*x^2+857.39*x*0.5=180
    133.42*x^3-255.86*x^2+857.39*x*0.5=2100
    (4+x)²=
    (4+x)²
    x^4+24x-x-1=0
    -x^2-5x=sqrt(x^2+x+1)
    y+y9/8=51
    x^2-10.5x+21.6=0
    （i-20%）*-38.89=0.02*-58.32
    （x-180)*(1-25%)/1500=(x-500)*(1-25%)/1000
    x^2-5.6x+6.8=0
    x^2-5.6x-6.8=0
    15+40-x=1.5(20+x）
    3.14/(sqrt(1-0.7^2)x)=3
    e^(-3.14*x/(sqrt(1-x^2)))=0.043
    30/x=45/(x+10)
    30/x*(x+10)
    （1+x）^3=0.4234

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