x+3≥0
    2（x-1）+3≥3x
    4x+5≥2（x+1）
    x+1≥2x-1
    4-a≥0
    6-b≤0
    4-a≤0
    2x-1≤3
    log(2,!(n))<=n^1.05
    log(2,n+1)<=2log(2,n)^2
    2sqrt(n)>=log(2,2n)
    sqrt(n)>=log(2,2n)
    5x>3 x<2
    -x^2>=lnx
    -x^2>=lnx-1
    4x<0.5x+5000
    3a^2＋2a－1＜0
    2x^2-3x-4＜0
    1.2x^2+3.5x-4.8≥0
    1.2x^2+3.5x-4.8≤0

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