x2-3x>-1.25
    x2-3x>1.25
    0.1x^2－36x＋3000≤0
    -x^2＋360x－3000≥0
    1/（2-k）＜0
    2x≤-1
    －x＞－4
    1＋2x／3＞x－1
    3x＞－3
    －x≦5
    (((-2/27)x^3+(4/9)x^2+(13/9)x-(56/27))/2)^2+(((-1/3)x^2+(4/3)x-(19/3))/3)^3<0
    ((-2/27x^3+4/9x^2+13/9x-56/27)/2)^2+((-1/3x^2+4/3x-19/3)/3)^3<0
    x^3>1
    x-2/3≤1/2x
    6x-2/x＜0
    6x-2/x＞0
    （1+x）*x/2＞60
    （1+x）*x/2＞0
    5(3x-1)>=28-2(6x-24)
    3/8x+1<=5/8x-3/4

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