4*x^3-13*x^2-35*x≤0
    6/x+1>1
     x^3-13x^2≥35x
    x^2-4x-32≥x-8
    2x/(x-7)/(x+4)≥0
    2x/(x-7)(x+4)≥0
    (x+9)/(x-2)≥0
    (x-5)/(x+8)＞0
    x^2+5x-50 ≥0
    x^2+5x-36≤0
    l20-3l＜2 20-3x-10＜0
    l20-3l＜2
    x²-3x+2＜0
    32+25x>64
    (2x+1)(3x+2)>12
    x≥1
    8x<=(x^2)+1+6x<0
    8x<=(x^2)+1+6<0
    1-(0.4)*n>0.99
    x(x²-1）>0

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