Mathematics
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    844.97×[1-1/(1+8.0%)^55. 79]
    (271.92+120.00+32.15+117.58+108.33)×(1+30%)
    (271.92+120.00+32.15+117.58)×20%
    (271.92+120.00)×30%
    2607*(40-36.3)^-0.25
    1/1894*0.4878/0.0283+0.0005/393*0.4878/0.0298+0.0001+0.004+1/(62.06*0.887)
    32/39-(8/27-7/39)
    4-3(100-94)^2/1600
    4-3(100-80)^2/1600
    4-3(100-94)^2/1600
    log(6,5)
    4-3(100-94)^2/1600
    arctan(9/8)
    arctan1.5
    207000/(0.614×9573×215)
    207000/(0.614×9573)
    50sin72
    50cos72
    1÷15
    ln0.4=

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