0.72/2.55
    237.8/（4.87*5.6*12）
    40.46*8.9
    26.54*8.96
    12+1.02-4.06
    5*203
    1.15*5.08
    1.15*4.87
    1.25*4.06
    1.2*4.06
    20*203
    20*03
    arctan60
    arctan3.278
    1/51.2
    1.2/3
    5/4一(5/1十15/4)
    10^1.231194
    lg4.58
    21^0.5

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