-1/3≤1/x
    -1/3≤1/3
    1/x≤3
    x^2-89x+1600<0
    2^n>=n^6
    -1≤x+sqrt(1-x)≤1
    -1≤x-sqrt(1-x)≤1
    -k+sqrt(k^2+4k-4)>4
    -x+sqrt(x^2-4+4x)>4
    -x+sqrt(x^2-4+x)>4
    1－x^2－2x＜4
    (60-x)(200+20x)≥24500
    (60-x)(200+x)≥24500
    x^5 +3*x^4-2*x^3+5*x^2-3*x- 1 < 0
    x^5>1
    p∧2+4p＜6-p p＞0
    p∧2+4p＜6-p
    p∧2+4p＜6
    -x^2-4x+3＞0
    2x^2+1> 9x−3

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