13.2c=（3.2+c）×7.93
    13.2c=（3.2+c）×7.94
    13.2c=（3.3+c）×7.94
    13.2c=（3+c）×7.94
    x^3+2x^2+3x+4＝0
    1013.250144*x*e(-x*0.0009811047)=0.447
    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

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