0
    2－x≥0
    100/(1+(x-1)^1.2)<(2.5*(sqrt(2*x+0.25)-0.5))/x
    2x+3/x-1大于等于1
    2x+3/x-1>1
    1+(x-1)^1.2<0.25*x
    (x^2)-15x<=0
    (x^2)-15x>=0
    (x^2)-15x-2000>=0
    -3x^2+6x<=2
    x²+x-1＜0
    x²-x+1＞＝0
    （x+2）²＞＝0
    1/(x−9)+1/(x+ 2)≥2x/(x^2+x−2)
    6x^2+2x-2>
    （21/2）a∧2-（9/2）a∧3＞0
    3x+(20-x)(-1)>=10
    (x^2-2)/(x+4)≥-3x+10
    3x-5<(11x-17)/(x+3)
    2x-4>(7x-11)/(x+2)

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