Mathematics
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    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
    -1600<-40x -40x<-1500
    2a+1>0 2a-3<0
    2x>-3 x-1<8-2x

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