1200=1000/（1+r/2）^40+100/2*(1-1/(1+r/2)^40)/(r+2)
    4.27*H*H*H+16072.22H=71670.24
    x*x+1.1138-2.19x=0
    1044/59270000
    -9a^(2)-4a+5=0
    4x^2-4x-15>0
    4x-1．6x=36
    5.24*10^(-10)t^4+1.34*10^(-5)t^2=10^-4
    40=(2000+10)/(1-X)*X
    x^2-600x+50000=0
    x+8=10
    59270000*ln(0.3*x)/x=1044
    59270000*ln(0.7*x)/x=1044
    59270000*ln(1*x)/x=1044
    [100/(1+6%+x+0.005045+2*0.5%)*0.25+100/(1+6%+x+0.005045)*0.5+100/(1+6%+x+0.005045-2*0.5%)*0.25]*88.58/100=82.47
    -（2.14-0.31x）-9.86<4.31x+2.3
    (100/(1+6%+x+0.5%))/(1+6%)*0.5+(100/(1+6%+x-0.5%))/(1+6%)*0.5=88.58
    X=0.188√(5.527+0.63733X^(2/3) )
    X=1.45-0.0902X^(2/3)
    90x*x-197.1x+73.638=173.88

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