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    1/4^3/2
    (8.63*11.64+8.7*8.13+857.86*3.4+19.68*0.15)/894.87
    0.3018*1.22
    tan120
    tan70+tan50
    17.33*6.86+448.51*2.03-111.1*7.08-354.91*2.58
    2∧5+2∧6
    7.2×(4.05+3.3)/2=
    7.2×(3.3+3.3)/2=
    7.2×(3.3+2.0)/2=
    2∧11
    2∧5+2∧7
    (12+(16-12)÷(100000-50000)×(86155.45-50000))×1.0×0.8
    (12+(16-12)÷(100000-50000)×(86155.45-50000))×1.0×0.9
    (9.6+(12-9.6)÷(100000-50000)×(86155.45-50000))×1.0×0.8
    (9.6+(12-9.6)÷(100000-50000)×(86155.45-50000))×1.0×0.9
    (60+(88-60)÷(100000-50000)×(86155.45-50000))×1.0×0.9
    lne/e
    7.312*(1.12^4-1)/(0.12*1.12^4)
    (22.4+(60-22.4)÷(50000-10000)×(12571.87-10000))×1.0×1.15

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