Mathematics
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    arctan(2×2.55)-arctan (0.199×2.55÷(1-0.25×2.55×2.55))
    (100*7%+(103.47-97.34))/97.34
    1+17.5%/1+53%
    14.1%*(1+17.5%/1+53%)
    arctan(0.5×6.17)
    [(120+100+240+180+200+180+80+160)/20]*1000
    80-16
    84+18/6
    480000/( 2000000/10)
    480000/( 4000000*8%)
    (480000-144000)/( 4000000*8%)
    111111111111111111+1
    60000/((430000+320000)/2)
    800000/((85000+75000)/2)
    log(6,36)
    2log(6,2)
    e^(ln18)
    sqrt(864)
    20*100+15*110+10*120
    10*20+10*22+5*22+10*25+4*25+6*28

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