Mathematics
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    1.5/(1+75%*20000/24000)
    1.5/(1+75%*20000/24000)*(1+75%*30000/25000)
    (16%-4%)/(12%-4%)
    24000+16000+4000-32000
    27+48
    (24000+16000+4000-32000)/12000*100%
    5280/40000+(5280/40000-1440/16000)*16000/24000
    6600/50000+(6600/50000-2150/25000)*25000/25000
    6600/50000+(6600/50000-2150/5000)*25000/25000
    lg(30/54)/lg0.9
    -90-arctan(2.1)-arctan(0.21)
    -3arctan(1.233)
    1/2+1/3+1/4
    arctan(2*√2)
    arctan2*√2
    3+22
    12%*75%*2400/(2400+3000)+16%*3000/(2400+3000)
    10%*75%*2/5+15%*3/5
    10%*75%*2/5+15%/3*5
    10%/75%*2/5+15%/3*5

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