(1-2x)/3+1/5>0
    2x+5>=3(x+2)
    128≤-4x^2+48x
    128≤-4x^2+24x
    x^2-6x+32≤0
    2x>-1
    （2k-1）^2<5
    6x>x+10
    5x-3≤2x+9
    225－x－150≥30
    1+2x>3x－3
    x2-6x+9=0
    2x-2>3
    （x*x+1）（x-1）小于0
    x*x-6x+8大于等于0
    （2x+1）(3x+2)>12
    (1000-10*x）/√x≥2
    2+5x≤（6-x ）
    [(22500-400Q)/2]^2-40000(900+Q^2)>0
    [(22500-400Q)/2]^2-40000(900+Q^2)

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