((1×119)+(2×121)+(3×469)+(4×561)+(5×2037))÷3337=
    (209.83+22.43)÷10＝
    (93.7+22.43)÷5
    (-0.5)^2
    (-0.5)^0
    4 * log(3000) - 12
    4 * (log(3000) - 12)
    6.4-1/3
    7-3/5
    24000（1-1/e）
    20*lg(2.1000)
    50.8+35.68
    （10025.82-7277.92）/77
    50.8×77+82.07×74.5
    50.8+38.17
    （10217.28-7277.92）/77
    10217.28-7277.92
    50.8×77+84.64×74.5
    25.4+5.55
    （5749.55-5322.12）/77

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