16-4t≤36
    3x^(2)-6x-1 >0
    (1003883.15*x)/(35.42*x)=0.038
    -2x≤4 2/x≥0
    3/2x-1-2/5x-1≤1 5x-1<3(x+1)
    1-5/2-3x<2/1+x
    1-2/2-3x<2/1+x
    x^4-x-2>0
    -1/2x^2+3x-5>0
    （1-x）/（2+x）≥1
    2<1-b+sqrt(b^2-2*b-7)<4
    -4x+x-x^2<0
    x^2-6x+9≤0
    4x^2+4x+1>0
    x-x^2+6<0
    x-x^2+6<0>
    3x^2+5x-2=0
    m^(2)－5/2<2m－1－5/2
    x^(2)－3x－4≥0
    x^(2)－9x＋14≤0

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