19.9×1.2
    219.04×0.556-2×24×√0.556
    175.57+18.9×2.3
    (25.81×4.4+478.07×2.23+186.6×0.34)/(31.68×5.08+290.68×2.36+51.04×0.35)
    84.82×2.825+2×13.1×√2.825
    72.02×2.825+2×13.1×√2.825
    72.02×1.8+2×24×√1.8
    3.98×1.8+2×24×√1.8
    3.98×1.723+2×49.1×√1.723
    0×1.723+2×49.1×√1.723
    72.02+18.3×0.7
    3.98+18.9×3.6
    19.9×0.2
    256.42×0.354-2×13.1×√0.354
    243.61+18.3×0.7
    5-2（5+3）
    5-2（5-3）
    arctan1/5
    3（2+5）
    500*20+36*50

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