abs((3x-1)/4)>=abs((6x+1)/5)
    （x^2-1）(x^2-6x+8)≥0
    x-1＜0
    4x-5/x^2-4<0
    200-a>6a a>30
    200-a>6a
    x（x+1）＞0
    3x-x^2＞0
    7^2+2x-5≤0
    1＜1.25*(9*x^(-2/3)-1)＜1.25
    1＜1.25*(9*x^(2/3)-1)＜1.25
    0＜1/9+1/(9*x^(2/3))＜1/2
    0<5x+10-8(x-1)<8
    0<5x+10-8x+1<8
    100*k^3-15*k^2-6*k+4<0
    (100*k^2)/3-2*k+1/3-4*k^2<0
    abs(3X-4)-1≥2
    absX+5<2
    2X^2+3X+2>0
    x^2-x+5≤0

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