x^2*ln(0.8*1.98/x/1.695)/(1-x)^2/ln(0.2*1.98/(1-x)/6.193)=1
    x^2*ln(0.8*1.90/x/1.695)/(1-x)^2/ln(0.2*1.90/(1-x)/6.193)=1
    x^2*ln(0.8*1.93/x/1.695)/(1-x)^2/ln(0.2*1.93/(1-x)/6.193)=1
    x^2*ln(0.8*1.94/x/1.695)/(1-x)^2/ln(0.2*1.94/(1-x)/6.193)=1
    x^2*ln(0.8*1.844/x/1.695)/(1-x)^2/ln(0.2*1.844/(1-x)/6.193)=1
    x^2*ln(0.8*1.544/x/1.695)/(1-x)^2/ln(0.2*1.544/(1-x)/6.193)=1
    V＝14250-6600-（0.155V+446.5118）-2850-783.75
    x^2*ln(0.2*4.679/x/1.695)/(1-x)^2/ln(0.8*4.679/(1-x)/6.193)=1
    y*(30+y)=175
    x^2*ln(0.4*3.777/x/1.695)/(1-x)^2/ln(0.6*3.777/(1-x)/6.193)=1
    x^2*ln(0.6*1.114/x/1.695)/(1-x)^2/ln(0.4*1.114/(1-x)/6.193)=1
    x^2*ln(0.8*1.944/x/1.695)/(1-x)^2/ln(0.2*1.944/(1-x)/6.193)=1
    x^2*ln(0.8*1.944/x/1.695)/(1-x)^2/ln(0.6*1.944/(1-x)/6.193)=1
    lnx＝1/x
    0.95x+7.2-1.0375x=0
    （3.5+x）×7.97=12.13x
    （9+2x）×（40+2x）×72%=90×40
    （1.005）^12t=e^((t^2)12）
    ((sqrt(5)-1)/2)^15=x
    x ^3 －3 x ^2 + 14 x －24

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