－x≥2
    40+2.5≤50(1-y)
    40-2.5≤50(1-y)
    40 2.5≤50(1-y)
    x^2+4x+3<0
    (x-40)[500-10(x-50)]≥8000
    a²＞1
    -1/15*(x-5)^2+3＞2.4
    (2x+1)/（x-1）<=1
    (x+5)/（x-14）<=0
    x+5/x-14<=0
    x^2+3x-18>=0
    x^2-8x-20<0
    4-5(X-2)<8-6x
    X-2(X-1)>0
    4m^2-12m>0
    x^32<1
    x^33<1
    a^2+1-2a>0
    330-（x-12）*20≥270

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