23+55X<25.5
    x-5＜x-12/3
    x-3＞2（x+2）
    x^2＋2x－7＞0
    30(200-4x+3x)+20(50-x+4x)<=8000
    30*(30*4+20)+(50-x)*(3*30+4*20)<=8000
    X ≥5.99 + 0.005 * X
    X≥5.99+0.005X
    X - X × 0.005 ≥5.99
    X-X×0.005≥5.99
    14.01+x-X×0.06÷12≥20
    -a-1＜a＜1
    -a-3＜-1＜-a+2/2
    a＜-a-1
    -a-3＜a＜-a-1
    3*x^2-26*x+48>0
    x-1/2-x-3/6<1
    a^2+1>0
    (x-1)/2<=(1+2x)/3
    x^2+x+1≥-102.753125

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