x^3-15x-4=0
    5*（1/15+1/12）+x*(1/12)=1
    X^3-2.41×319.1242^2-（27.08-8.45×0.0001×319.1242^2）×X^2=0
    18x=22(x-1.5)
    10x/2 = 12(27-x)/3
    0x/2 = 12(27-x)/3
    10x/2=12(27-x)
    x-x-2/2=1+2x-1/3
    (sqrt(3*x^2+4)+sqrt(x^2+2))/sqrt(x^2+1)=sqrt(2)/2
    27x^3=64
    X^3-2.41×320.8834^2-（27.08-8.45×0.0001×320.8834^2）×X^2=0
     75=1 *1*e^(14.39155-2795.817/(x+230.002))+1.679*(1-1)*e^(16.59381-3644.297/(x+239.765))
     75=1.006*0.9*e^(14.39155-2795.817/(x+230.002))+1.679*(1-0.9)*e^(16.59381-3644.297/(x+239.765))
     75=1.026*0.8*e^(14.39155-2795.817/(x+230.002))+1.506*(1-0.8)*e^(16.59381-3644.297/(x+239.765))
    3*450x=5*300(21-x)
     75=1.059*0.7*e^(14.39155-2795.817/(x+230.002))+1.368*(1-0.7)*e^(16.59381-3644.297/(x+239.765))
     75=1.108*0.6*e^(14.39155-2795.817/(x+230.002))+1.259*(1-0.6)*e^(16.59381-3644.297/(x+239.765))
     75=1.174*0.5*e^(14.39155-2795.817/(x+230.002))+1.174*(1-0.5)*e^(16.59381-3644.297/(x+239.765))
     75=1.259*0.4*e^(14.39155-2795.817/(x+230.002))+1.108*(1-0.4)*e^(16.59381-3644.297/(x+239.765))
     75=1.368*0.3*e^(14.39155-2795.817/(x+230.002))+1.059*(1-0.3)*e^(16.59381-3644.297/(x+239.765))

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