√256
    arcsin(0.857)
    60.5/7149171.3
    23/4796041.5
    32/4796041.5
    68.8/4796041.5
    3282.9*2177.7
    110000000/4796041.5
    11000000/4796041.5
    2682.8*1787.7
    -8×（3/4）^2＋12×3/4
    3.84*9.6+9.6*61.6=
    3600*6/(sqrt(20))
    6*9
    10lg6.544
    (1+sin47.3)/(1-sin47.3)
    sqrt(2000)
    arctan(sqrt(20))
    20lg(0.082256)
    1/9/sqrt(1.0081)/sqrt(1.81)

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