2864.789024/1.839
    3.170*903.718935
    2864.789025/2.101
    8.995*10^3*(0.00012^0.5/20)*4.57
    8.995*10^3*(0.00012^0.5/10)*4.57
    8.995*10^3*(0.00012^0.5/30)*4.57
    8.995*10^3*(0.00012^0.5/40)*4.57
    0.55*15.4^(-0.5)
    15.6-4.8/1.6
    1×7
    1*7
    1乘7
    216.6^0.5
    arctan（(1-tan23)/(1-tan22)）
    arcsin(2^0.5*340*sin4.96/194.35)
    arcsin(520/668.88*sin100)
    (520^2+340^2-2*520*340*cos100)^0.5
    arcsin(38/42)
    296.08+284.23+272.34+260.41+248.43+236.42+224.36
    9-1.8*1.8

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