2-6x≤4
    5+2x≤-3
    5+2x≥3
    5+2x≤-3
    5+2x≥3
    (x+1)/(x-2)>0
    2x-3/x+1<0
    x-1/2x+1<0
    1-x/2x+1<0
    x^2+x-2<0
    （x-1)²(x+3)<0
    2x-1＞√5x
    2x²-x-1＜0＞
    0<180*(n-2)-1680<180
    -（x^2）+2x+3≥0
    1+X^2>=0
    X(X-4)>12
    4X-5>15-X
    (1.002-0.001)^x*(0.998-0.001)^(100-x)>0
    (1.01-0.001)^x*(0.99-0.001)^(100-x)>0

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