cosx²
    x/2+x^2×sin(1/x)
    x^5+10x^3+20x-25 = 0
    x^5+10x^3+20x-4=0
    x^6-21x^5+175x^4-735x^3+1624x^2-1764x+720=0
    4^x+6^x=9^x
    994.9×((tan(arc0.725)）−(tan(arc0.95)))
    x^3+6x-24=0
    x2/x+1
    （475+x）/（390+x）=1.3
    -3(x^2-x)
    -3（x^3-x）
    e^(-(-15.6+5.6)*4190/8.314/310)=x*10^9/(6.25-x)/(12.5-x)
    e^(-(-15.6+7.2)*4190/8.314/310)=x*10^9/(100-x)/(200-x)
    e^(-(-16.6+7.2)*4190/8.314/310)=x*10^9/(100-x)/(200-x)
    e^(-(-16.6+7.2)*4190/8.341/310)=x*10^9/(100-x)/(200-x)
    2+sinx
    x=[38.8+（103.8-38.8）/（3000-1000）*（2401.54-x-1000）]*1.2*0.85*1.0
    （5.8-5.8/1.13*0.13+0.13）/6.78=x
    （7-7/1.13*0.13+0.15）/6.78=x

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