sin4.71
    sin0.5
    2-(-4)+6/(-2)+(-3)*2
    -2^2*1/2+8/(-2)^2
    lg0.03
    lg0.0000175
    lg0.00000000056
    lg5.6
    lg0.00000648
    √0.42
    √5.6×0.075
    5.04*100000/0.3/(4*10000000)
    log（10，0.0001085）
    60/40000
    1+45.08%
    (421.02×3.14+460.91×0.80)/(31.68×6.08+290.68×3.36+129.46×0.83)
    95.94×2.825+2×13.1×√2.825
    64.83+18.3×1.7
    274.72×0.354-2×13.1×√0.354
    243.61×0.354-2×13.1×√0.354

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