(x-1)*(x+2)/x^2+1<0
    m^2+2m-15>0
    m^2+2m-12>0
    x^2-3x+2/x^2+1<0
    （x-1)(x+2)/x^2+1<0
    （x-1)(x+2)/x^2+1
    （x-1）（x+2）/x^2+1
    x－2＜1
    ((6/2.84)^1.5)×(1.4/3600)
    (2571a)^(2/3)＝2.112676
    0.00284×(3600a/1.4)^(2/3)＝0.006
    16.9-3517×(0.001^2)-9.009×0.001^(2/3)
    16.9-3517×(0.003^2)-9.009×0.003^(2/3)
    16.9-3517×(0.004^2)-9.009×0.004^(2/3)
    16.9-3517×(0.007^2)-9.009×0.007^(2/3)
    23.81-27342.77×(0.007^2)-11.2×0.007^(2/3)
    23.81-27342.77×(0.004^2)-11.2×0.004^(2/3)
    23.81-27342.77×(0.003^2)-11.2×0.003^(2/3)
    23.81-27342.77×(0.001^2)-11.2×0.001^(2/3)
    (0.03128+0.005819)/(0.101×2.5748)

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