(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
    1000÷0.7
    0.1+10/127.5+5/89.14+17.3/102+4/133.58+3/44.7+3/561=
    15^3
    11*45*14
    （1616.87+32.34+35.49)×5.5%
    （1616.87+32.34+35.49)×8%
    （1616.87+32.34+35.49)×5%
    （1616.87+32.34)[(1+0.0435)^0.5-1]
    1616.87×0.02
    1-24/115

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