a^2-3＜4
    a^2-3＜ 4
    80x+50(50-x)≤3000
    7-x/2-3<(3+4x)/5-4
    x-(3x-8)/2<2(10-x)/7-1
    7x/3-11(x-3)/6<(3x-1)/5-(13-x)/2
    1200+40(16x-100)≥200
    2x+1≥5(x-1)
    m^2+6m+1>=0
    abs(1-2x^2)
    (x^2+5x-3)/(x-1)>=0
    -7x^2-112≥0
    -4<-2x^2-1<4
    -4x^2-1<4
    4x^2-36x+45＜0
    -2x^2+15x-616≥0
    -2x^2+157x-500≥1300
    k/2>1
    a＾2－2a－3＜0
    a＾2－2a－1＜0

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