12x^2-52x+55<=0
    12x-52x+55<=0
    5＞2a
    4＞2a-1
    3＞2x
    4＞2x-1
    4+2x＞4x-1
    3+2x+1＞4x-1
    3+2x＞4x
    3＞2x
    3+2x+1＞4x-1
    4x^2-4x＞15
    -4≤x^2-3x＜18
    468-3x＞160-x
    x＋1/3-x≥0
    2x^2-x-6＞0
    2000+0.23*100*x > 0.5*100*x
    5*x>10
    x2-2021×x+2020＜0
    x2-2021x+2020＜0

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