0.5*0.15*0.2
    0.04/(0.04+0.15^2)
    (4/7)^2*0.15^2+(3/7)^2*0.04+2*4/7*3/7*(-0.03)
    1412.84-286.423*2.5+47.732*16+1.39*2.5*16+17.11*2.5*2.5+0.29*16*16
    x-x/1.13=42000
    a-a/1.13=42000
    log（45，7）
    1464+11.4*24-11*60+5.7*16
    1464+0.114*24-0.11*60+0.057*16
    0.332871*1.648721
    lnx=-1.1
    ln-1.1
    lnx=0.5
    lnx=-1.1
    e^(-0.5^o.5)*(1/0.5)+e^(-0.5^o.5)*(-1/2)*0.5^-o.5*ln0.5
    e^(-2^o.5)*(1/2)+e^(-2^o.5)*(-1/2)*2^-o.5*ln2
    22759.895*12968.197
    22.759895 *12.968197
    lnx=41/16
    (1+12%/4)^4-1

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