272.84/1.2
    32.25×18×470
    √((49.93/253.23)^2+(66.57/408.5)^2 )
    817×500
    (39.94×10^6×150)/90000
    199.7×0.20
    4×22500
    ［2046×（1+0.0465）×1.1080×1.3612+0］×0.9899
    ［1-1/（1+6.50%）^60.47］/［1-1/（1+6.50%）^70］
    32.25×18×470
    32.25×20×470
    1×(π×〖32.25〗^2)/4×310
    199.7/4
    arctan(5.6/5)+90-arctan(5.6/0.28)-arctan(5.6/100)
    0.677×(64.7×300^4)/(100×206000×18000)
    0.677×(64.7×300^4)/(100×9896×18000)
    (0.92×10^6)/6000
    0.1×83.23×〖0.3〗^2+0.177×10.73×〖0.3〗^2
    1.0×[1.0×(1.0+57.2)+1.0×(2.5+4)]×1
    1.1×1.3×(1.0+57.2)×1

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