Mathematics
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    arctan-0.2278
    arctan(-0.441)
    120×13735×26+120×13735×0.87
    (-2.731×0.262+72.31×0.26+253.9)/(-2.731×1.42+72.31×1.4+253.9)
    40-8*4
    40-8*4
    (40-8)/4
    18/(6/2)
    18/6*2
    24/(3*2)
    24/(3*2)
    24/3/2
    24/3/2
    75-(39+21)
    75-39-21
    6-(25+7)
    (23+25)/8
    18+24/6
    28+3*6
    45/(9-4)

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