285000/(4.8*287)
    69000/(287*1.6)
    2/3-8/(9*π)
    4/(3*π)
    4/3π
    8.995*1000*(0.0008^0.5/10)3.2
    8.995*1000*(0.0006^0.5/7)2.6
    8.995*1000*(0.0006^0.5/15)4
    8.995*1000*(0.0009^0.5/10)3.17
    8.995*1000*(0.0008^0.5/10)3.17
    8.995*1000*(0.006^0.5/10)3.17
    8.995*1000*(0.0006^0.5/10)3.17
    8.995*1000*(0.000006^0.5/10)3.17
    8.995*1000*(0.00013^0.5/3)1.9
    8.995*1000*(0.00013^0.5/15)3.5
    8.995*1000*(0.00013^0.5/10)2.4
    0.012*（92.9+12）/92.9*7.87/7.8/100
    (2*√21-2)/10
    (2√21-3)/10
    (√21-3)/10

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