5600*90%
    200*80%
    5.0625*3.14
    4.5/2
    4*125%
    4/25%
    7/23÷3/26+7/13
    (10+7.5/2)(500-40*7.5/2)
    2*(7.5/2)^2-5*(7.5/2)-25
    80e2-100+e
    1/arctan√8
    arctan√8
    log（2，1000）
    log（2，50001）
    lg50001/lg2
    lg50001
    lg50000
    1008/2.8
    100/23
    (1.618034)^8+(1/(1.618034)^8)

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