s^4+12s^3+98s^2+450s+625=0
    s(2s+6)(s^2+8s+25)=(s^2+6s+25)((s^2+8s+25)+s(2s+8))
    x=270/x+3
    x+3=270/x
    1-x*x*x=3-3x
    1-x*x*x=43-43x
    800*（100-x）=(80-x)*1800
    10.09375x^2-50x=375*5
    0.25*(1+0.5x)*(1.27+0.3x)=1
    0.25*(1+0.5x)*(1+0.3(x+0.9))=1
    0.25*(1+0.5x)*(1+0.3x)=1
    x*(x+1)*(x+2)
     X^2+1.4X-0.14 = 0
    X^2+1.4X-0.14=0
    0.1X^2-0.05X-0.525=0
    x²=25
    x²=11
    3.14*x²=55
    1.5*3.14*x²=55
    1.5*3.14*（x）²=55

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