lnx+3/x+1＜0
    -41800+（30000+W）-（4500+W*10%/4）≥3000
    (x^2-1)/(x-2)>0
    -1/4*x^2+2*x-3>0
    (m-1)/2/m<=2
    (m-1)/2m<=2
    5574+14x>3600+32x>588+17x>697+15x>626+14x>120+20x>580+13x
    588+17x>697+15x>626+14x>120+20x>580+13x
    588+17x>697+15x>626+14x>120+20x
    588+17x>697+15x>120+20x
    588+17x>697+15x
    160+46x >753+20x>969+16x>23x+550
    160+46x >753+20x>969+16x
    160+46x>753+20x
    4x^2-21x+72≦0
    (√5-1)(√5+1)≥x
    x－8－（4x－32）/x≤3.36－224/25x
    x^2-4x≥-4
    xx+4x+1≤0
    （x-1）（x+4x+1）≤0

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