abs（x^2-3x）＜4
    absx^2-3x＜4
    absx^2-3＜4
    17.5x>50(x-3)+20
    a*a-2+a＜0
    a*a-a-2＜0
    a*a+a-2＜0
    a*a+5a+4＜0
    2x²-x+1≤0
    4x²+4x+1＞0
    x²-10x+25≤0
    2x²-4x+7≥0
    X-2/(X+1)(X+1)(X-2)<1
    x-2/（x+1）2（x-2）<1
    abs(x－1)＜1
    x^2－2x≥0
    2x^2+x＞0
    x^2－2x+3＜0
    (35/36)^x >= 1/2
    x^2-9x+1＞0

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