Mathematics
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    8/0.4/8%*100*9%*100*0.3
    (21.2%+17.5%+24.3%)/3
    (8/2+8.1/3+11/2.2)/3
    (8/2+8.1/3+11/2.2)/3/(21.2%+17.5%+24.3%)/3
    90-arctan6.32-arctan(0.008*63.2)+arctan(0.03*63.2)
    90-arctan6.32-arctan0.008*63.2+arctan0.03*63.2
    [(223+608)*(1+0.18+0.466+0.2+0.2+0.24)+311]*(445.1%*5+70%*12.5)*(0.2+0.8*(2.5+0.662))*(1+0.583+0.4)*0.8*0.5
    [(223+454)*(1+0.18+0.466+0.2+0.24)+311]*(445.1%*5+70%*12.5)*(0.2+0.8*2.5)*(1+0.583+0.69)*0.8*0.5 =
    [(223+510)*(1+0.18+0.466+0.413+0.2+0.24)+311]*(445.1%*4+70%*10)*(0.2+0.8*2.5)*(1+0.583+0.8)*0.8*0.5
    10lg4
    0+π
    90-arctan(2.3/5)-arctan0.23
    [35169.16*5.4172-60000]/5.4172
    7.5%*75%*2/5+10.94%*3/5
    7.5%*75%+(4.5%+1.5*(9%-4.5%)+7.5%+5%)/2
    7.5%*75%+(3.4%+1.5*(9%-3.4%)+7.5%+5%)/2
    7.5%*75%+(3.8%+1.5*(9%-3.8%)+7.5%+5%)/2
    (3.8%+1.5*(9%-3.8%)+7.5%+5%)/2
    3.8%+1.5*(9%-3.8%)
    1.75/(1+75%*1)*(1+75%*2/3)

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