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
    x+1=-1
     2 x 960527
     3 x 3 x 3 x 29 x 2377
    x^2-10.7x+28.6=0，x
    s(s+2)(s+3)=(s+5)((s+2)(s+3)+s(s+2)+s(s+3))
    2x^3+15x^2+26x+30=0
    X^2+3X-2=0
    (s+4)(s^2+4s+20)+s(s^2+4s+20)+s(s+4)(2s+4)=0

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