x-8/3>x-5
    4-x≥x x^2+16≥8x
    16+(4-x)^2≥8(4-x)
    4+(4-x)^2≥8(4-x)
    x^2+16≥8x
    16+x^2≥8x
    8+x^2≥8x
    x^2-3x+5>0
    3(3(3x-2)-2)-2>190
    (3x-2)^3>190
    27×a∧6－81×a∧5＋135×a∧4－9×a∧3＋63×a∧2－9×a－1≧0
    3.9a^3+3.9>6a^2
    3.9a^2+3.9>6a
    X ^3+x-12＞0
    -x+2x+3大于等于0
    (x+1)/(1-x)>=e(3x)
    (x+1)/(1-x)>=e3x
    x(2x-1)(2x-4)>0
    3x+2大于等于0
    5(x-2)-1>3+8(x+1)

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