3531.5+284+1250
    （7963+7963+3981.5）*1.25
    3291+230+100+192+575+575+1500+1500
    0.6/sqrt(5)
    （1+5.7%）^0.5-1
    （1+5.7%）^1.5-1
    （1+5.7%）^2.5-1
    （1+5.7%）^3-1
    (62.53×870^4)/(100×210000×1983000×2)
    (62.53×1×0.87×1000)/(3.14×9^2 )
    (62.53×3×0.87×1000)/(3.14×9^2 )
    0.9*（（1.2×（0.3+24*0.6+1.5*0.6）+0.9*1.4*4.5）*0.25+1.2*0.035）
    139-0.025*139=
    139-0.28*139=
    132.63×0.85/6
    (26.21×10^3×2.35×10^4)/(2×1983000×5.3)
    (19.93×10^3×2.35×10^4)/(2×1983000×5.3)
    (17.79×10^3×2.35×10^4)/(2×1983000×5.3)
    (40.90×2500^4)/(100×210000×1983000×2)
    (40.90×870^4)/(100×210000×1983000×2)

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