（0.24+0.36+0.25）×2
    1500×12
    212.5*30.28-212.5*32
    5600*30.28-600*32-5000*30
    C(6,2)
    13.92+10.3
    24.88×1.15+2×10.5×√1.15
    140.12×1.15+2×10.5×√1.15
    62.38×1.15+2×10.5×√1.15
    62.38×1.17+2×9×√1.17
    37.5×1.17+2×9×√1.17
    62.38+6.27×12.4
    37.5+7.54×3.3
    7.5+7.54×3.3
    102.63×1.15+2×10.5×√1.15
    4.88+6.27×12.4
    82.81×1.15+2×10.5×√1.15
    24.88+6.27×9.24
    (22.84-10.3)×10
    97.89×0.87-2×10.5×√0.87

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