(ln(169/(576*x))*x^2)/(ln(1521/(30451*(1-x)))*(1-x)^2)=1
    X-7.5=0.05X
    (ln(1853/(4320*x))*x^2)/(ln(1853/(94500*(1-x)))*(1-x)^2)=1
    (ln(457/(1440*x))*x^2)/(ln(914/(23625*(1-x)))*(1-x)^2)=1
    (ln(1342/(1235*x))*x^2)/(ln(2013/(4930*(1-x)))*(1-x)^2)=1
    2x^2 + x + 1= 0
    x*(x+0.08)=(0.02-x)*10^(-4.87)
    x*(x+0.08)=(0.02-x)*1.34*10^(-5)
    (ln(658/(2223*x))*x^2)/(ln(329/(493*(1-x)))*(1-x)^2)=1
    (ln(72/(247*x))*x^2)/(ln(324/(493*(1-x)))*(1-x)^2)=1
    (ln(1645/(4446*x))*x^2)/(ln(1645/(2958*(1-x)))*(1-x)^2)=1
    (ln(4000/(2223*x))*x^2)/(ln(1000/(1479*(1-x)))*(1-x)^2)=1
    0.02*0.0000134=x^2+0.0800134x
    1/d+1/(d+1)=1/(d+2)
    2/d+1/(d+2)+1/(d+4)=1/(d+1)
    -x^3 + 26x -100 = 0
    400×（1+I）∧2 = 449.44
    400×（1+I）∧2＝449.44
    (ln(329/(741*x))*x^2)/(ln(658/(1479*(1-x)))*(1-x)^2)=1
    x^2*ln((0.6*3.29)/(x*4.446))/((1-x)^2*ln((0.4*3.29)/((1-x)*2.958))=1

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