(283.9×10^3)/(2×500×20)
    (301.23×10^3)/(500×20)
    (2×283.9)/(2×π×0.3)
    283.9/39.7
    (148.5×10^6)/(0.71×1138750×215)
    4.332-1.201
    4.544-(4.312+4.332)/2
    4.311-3.991
    7/7*3
    28-4*6
    4*9/6
    66-42+21
    66-42+21
    81-45+36
    92-28+33
    47-21-15
    3*6-5
    44+4*7
    【13000×1.72×（1+1.72）^12】÷【（1+1.72）^12-1】=
    90-arctan0.632-arctan3.16

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