√58.6677
    1*2x*3x^2<7
    14x<7
    0.49×(1.148×0.3961)^(-0.245)
    √1.319
    （2.85-0.1）/0.01×0.4
    ((x-1)*(x+2)/x^2+1)<0
    (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)

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