0.36（U-4）=0.2（U-2.4）
    0.331=0.074x-0.0109
     1/d+1/（d+2）+1/（（d+1）^2+4） = 0
    1/d+1/（d+2）+1/（（d+1）^2+4）
    225（1+x）^2=819
    6000(1-x)^2=3600
    5000(1-x)^2=3000
    x^4-2375*x^2+125000=0
    2/(d-0.4)+1/(d+9)=1/(d+0.5)
    (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

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