3969/63
    49*81
    83^2
    arctan（2*3^0.5）
    arctan（2*3^0.5）
    20cos(77)
    3.14%*1100/2000+5.5%*900/2000
    40+（12+20）*0.75-（800+600+900+700-180-220）/2*4.07%
    （4800+4600+2850+2650+2000+2000-2500-2000）/2
    3.56*4850/9650+5*4800/9650
    324.01×（1+5.7%）×0.8855
    115.95+95.00+39.5+8.83+20.04+44.69
    （115.95+95.00+39.5+8.83+20.04）×16%
    （115.95+39.5+95.00）×8%
    （115.95+39.5）×1×4.35%+95.00×1×0.5×4.35%
    （437.75+80.00+20.71+21.21）×0.06
    （0.01）×[（1+0.0435）^0.5-1]
    437.75×[（1+0.0435）^1-1]+（80+20.71）×[（1+0.0435）^0.5-1]
    （437.75+80）×0.04
    （437.75+0）×0.04

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