Mathematics
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    2.5*(0.8/0.9)^0.5
     77×21+45-12+111×4523655
    77*21
    4523655*111
    (4/7)*(3/5)
    (4/7)/(3/5)
    (4:7)÷(3:5)
    (4÷7)÷(3÷5)
    (4/7)÷(3/5)
    sin1/cos1
    arctan-2/3
    1/2arctan(-4)
    1/2arctan(8)
    1/2arctan(8)
    30.6×0.69×0.5
    46×0.69×0.5
    25.5×0.69×0.5
    11.7×0.69×0.5
    47×0.69×0.5
    27×0.69×0.5

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