Mathematics
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    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
    20lg60
    20lg50
    20lg70
    20lg3000
    20lg30
    20lg300
    275863.368/17.64
    0.298×12×77143
    0.85/(2+0.85)=

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