x-400/x<=30
    1-x＜2/x+1＜1+x
    1-x＜6/x+3＜1+x
    a^2<4
    （60.0416/a-4.689456）*1.455*e(-21/a)+0.0068*a＞0
    5x+4＞x-1/3
    3（x-2）>2(x+9)
    6x-e^x+2>0 6x-e^x<0
    6x-e^x+2>0
    m∧2－3m≤－2
    ((8-2y)/3)y≥2.5
    960-10k>16.5×sqrtk
    ((48.4-k)*0.5250626+(39.6-k)*(1-0.5250626))0.9875778004938814<44-k
    48.4-k>1
    48.4-x>1
    abs(3x-4)-1>=2
    abs(x-3<12
    abs(x+5)>=0
    4x-x^2>=0
    (x^2+1)(x-1)>0

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