Mathematics
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    90-arctan0.29-arctan1.45
    90-arctan0.408-arctan2.04
    90-arctan0.28-arctan1.4
    C(6,2)
    2127÷(28×5.5+0.8×5.5²)
    2127÷(28×5.5+0.8×5.5²)
    2127÷(28×5.5+5.5²)
    250000/12
    53+5*9
    18+24/6
    (44-39)/5
    32/4+78
    100-9*9
    40/8+55
    40-4+20
    49/7+27
    63/9*8
    40-4+20
    70-5*9
    19/(51-12)

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