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
    x^2-3x≥0
    2X-1≥3 3X-2<7
    2X-1≥3
    (x-1)(x-3)≤0
    (x+1)(x+3)≤0
    2<0
    (x-2)(x-2)+(x+1)(x+1)<8

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