Mathematics
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    5*(20000)^2*36/(48*206*10^9*22500.82*10^-8)
    142857×76923
    0.142857×0.076923
    arctan1.964/4.598
    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)

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