0.293×12×77143
    0.83/(2+0.83)=
    (34615+34615+29630+29630)/(2×77143)=
    170331.744/17.64=
    0.184×12×77143
    0.45/(2+0.45)=
    (34615+34615)/(2×77143)=
    33.9＾6-282636.3872×33.9＾4+739898611.1×33.9＾2-478853785000
    20lg110
    274011.936/17.64
    0.296×12×77143
    0.84/(2+0.84)=
    (34615+36000+29630+29630)/(2×77143)=
    173108.892/17.64
    0.187×12×77143
    0.46/(2+0.46)=
    (34615+36000)/(2×77143)=
    2×3×10^4×250×600^3/12/7800
    20lg90
    20lg80

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