Mathematics
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    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)
    (250*39+300*61)-(200*39+240*61)
    (250*38+300*62)-(200*38+240*62)
    0=0/x
    0.0
    1
    0.5

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