3.19×54 - 15.2×5.4 + 1.67×46
    4.6×1.2 + 18×0.12 + 0.64×0.5
    1.8×12.5 + 0.62×125
    37.8×2.5 - 3.74×25
    24.25×7.19 + 0.23×281 + 1.25×0.81
    13.2×0.61 + 0.132×11 - 0.72×0.7
    4.24×1.71 + 424×0.0552 + 72.3×0.576
    4.5×5.2 + 0.36×52 + 0.81×48
    280×3.29 + 32.9×22 - 89×5
    1.13×81 - 11.3×1.7 + 0.64×12
    3.7×5.2 + 0.37×13 + 0.065×630
    182=x-（x/0.7）*0.05
    x^2015-x^2014
    3x≥x+9>3+2x≤xx-x-7
    0.|3
    60a+80(150-a)<10840 150-a>1.5a
    ln1.098612
    ln3
    ln(3)
    (250*40+300*60)-(200*40+240*60)

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