x/x-20>10
    x+1>2x-1
    x^2-180x+8000＞0
    x2-180x+8000＞0
    2a＋4＜－13a
    2a＋4＜－13a
    x^2+x+20<0
    x^2+x^100+20<0
    5x^2+x^100+20<0
    5x^2+x^100+2000<0
    5x^2+x^100+2000>0
    55x^2+x^100+2000>0
    x^100000666+x^100+2000>0
    4x^2+x<0
    4x^2+5x<0
    4x^2+5x<0
    45454x^2+5x<0
    45454x^2+5x<0
    99999999945454x^2+5x<0
    99999999945454x^2+5x>0

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