sinA0.5
    13.2c=（c+3）×7.93
    2s(s^2-1)(s^2-9)=(s^2+4)(2s(2s^2-10))
    s(s+1)(s+2)=(3s^2+6s+2)(s+10)
    s(s+1)(s+2)=(3s^2+6s+12)(s+10)
    s(s+1)(s+2)=3s^2+6s+12
    x/0.09+(147065.38-x)/0.13=1309000.5
    s^3+36s^2+120s+20=0
    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)

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