(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
    x^2 + 10x +26 = 0
    1x^3 -4x^2 + 8x -6 = 0
    x^3 -8x + 6 = 0
    X(150-X)=3600
    1/d+1/(d+1)+1/(d+3)=1/(d+2)
    x^2 + 4x -1 = 0
    x-x*0.07=50000
    3x^3 + 16x^2 + 26x + 16 = 0
    ln（x/2.173）=（84000/8.314）（35/1-25/1）
    8x^3－4x^2＋8x－6＝0
    14.3*400*x*(655-555+0.5*x)=360*1520*655-360*1964*145

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