16/25-4/7
    10/13-16/25
    (27/1300)^(1/2)
    0.769231^2*0,15^2+0.230769^2*0.04+2*0.769231*0.230769
    10/13
    (0.2^2-3/200)/(0.04+0.15^2-2*3/200)
    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

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