50*360/5.081/2/3.1415926
    50*360/1.972/2/3.1415926
    50*360/4.314/2/3.1415926
    50*360/2.419/2/3.1415926
    50*360/4.629/2/3.1415926
    4500/3.1415926/0.050011
    arcsin0.049990
    √265
    √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=

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