(x^2*ln(0.51*1452/x/1698))/((1-x)^2*ln(0.49*1452/(1-x)/4436))=1
    (x^2*ln(0.51*1452/x/1698))/((1-x)^2*ln(0.49*1452/(1-x)/4436))=1
    (x^2*ln(0.51*1452/x/1698))/((1-x)^2*ln(0.49*1452/(1-x)/4436))=1
    (x^2*ln(0.51*1452/x/1698))/((1-x)^2*ln(0.49*1452/(1-x)/4436))=1
    (x^2*ln(0.51*1452/x/1698))/((1-x)^2*ln(0.49*1452/(1-x)/4436))=1
    (x^2*ln(0.51*1452/x/1698))/((1-x)^2*ln(0.49*1452/(1-x)/4436))=1
    (x^2*ln(0.51*1452/x/1698))/((1-x)^2*ln(0.49*1452/(1-x)/4436))=1
    (x^2*ln(0.51*1452/x/1698))/((1-x)^2*ln(0.49*1452/(1-x)/4436))=1
    (x^2*ln(0.51*1452/x/1698))/((1-x)^2*ln(0.49*1452/(1-x)/4436))=1
    (x^2*ln(0.51*1452/x/1698))/((1-x)^2*ln(0.49*1452/(1-x)/4436))=1
    (x^2*ln(0.64*1722/x/1698))/((1-x)^2*ln(0.36*1722/(1-x)/4436))=1
    12x-165*12=1500+250*12
    44x(0.15+x)=0.05-x
    x^2+sqrt(3)/3x*sqrt(4-x^2)=4*sqrt(3)/3*x^2
    10000/x+20000/（x+60）＝150
    -x^2-sqrt(3)/3x*sqrt(4-x^2)=4*sqrt(3)/3*x^2
    -x^2-sqrt(3)/3x*sqrt(4-x^2)=4*sqrt(3)/3*x^2
    x^3－2x^2－7x＋12＝0
    -1/3x^2*sqrt(4-x^2)=sqrt(4-2/3x^2)
    -1/3x^2*sqrt(4-x^2)=0

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