480×25%
    480÷（1-25%）
    40×30%÷5/8
    （-1.25）*5/4*（-8）*（-3/4）
    =0.97^(1/（60-31）)/(1-10%)^(1/（60-31))
    =(0.97^(1/60-31)/(1-10%)^(1/60-31))
    1.015228 × 0.6087
     1.015228 × 0.3913
    (13.91%-8%)/14.26%
    [(0.3913^2*900)+( 0.6087^2*100) + (2 *0.3913 *0.6087*60)]^0.5
     (0.3913 × 0.20) + (0.6087 × 0.10)
    (（20%-8%）*100-（10%-8%）*60)/(（20%-8%）*100+（10%-8%）*900-（10%-8%+10%-8%）*60)
    [(4.55%^2*900)+( 95.45%^2*100) + (2 *4.55% *95.45%*60)]^0.5
     (4.55% × 0.20) + (95.45% × 0.10)
    0.04*50
    2/0.04
    2*0.04
    2826:1256
    2826:1257
    471:314

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