4*x*x*x+31*x*x+41*x+20=0
    -1.05745484=(1/x)*ln(1-x)
    0=x^{5}+10x^{3}+20x-4
    -1.08945343=(1/x)*ln(1-x)
    5*96485*(exp(1/0.0257-x+2000)-exp(-1/0.0257+x+2000))=-0.0257*x*(0.12+0.0001*x*x)
    5*96485*(exp(1/0.0257-x+2)-exp(-1/0.0257+x+2))=-0.0257*x*(0.12+0.0001*x*x)
    X/87-(100-X)/1000=.381
    ln（1+2x）
    xxx+xx-4x-4=0
    (98-0.18*x)*(294-0.27*x)*(441-0.27*x)-196*196*(98-0.18*x)-98*98*(441-0.27*x)=0
    (98-0.18*x)(294-0.27*x)(441-0.27*x)-196*196*(98-0.18*x)-98*98*(441-0.27*x)=0
    V=309.87+0+9.30+0.01V+10.85+0.0002V+26.40+0.0008V+0.0538V
    (98-180*x)(294-270*x)(441-270*x)-196*196*(98-180*x)-98*98*(441-270*x)=0
    x-1=0
    354/30*x+155.5/30*(x+15)+90/30(x+30)=918
    2x^5-x^4+4x^3-2x^2-48x-1=0
    x^6+26x^4+100x^2=3600
    x^2+26x+100=0
    30x+24*3x+36*36x=2354.04
    18*24x+36*22x=2009.88

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