(k-1)^4-(k^2+1)×(k-1)×(k-3)≥0
    (4(k-1)^2)^2-4×(k^2+1)×(4×(k-1)×(k-3))≥0
    Cos x＜1
    6（2/3x+1）≥2x-5
    x＾2-7x+10>0
    -x^2+2x>0.648
    x＞5 3x^2＜e
    （-1-2lnx）/x＾3＞0
    m^2-m-1>0
    (x+1)^2*(x-1)/x>0
    16x^4+(1/2304)x^2-1/8>0
    16x^4+(1/4608)x^2-1/8>0
    x^4+(1/9216)x^2-1/2>0
    x^4+(1/9216)x^2-1/4>0
    16x^4+4x^2-1<0
    (x+2)/(x-1)<=0
    X^4+(1/9216)X^2-1/4>0
    X^4+(1/4096)X^2-1/4>0
    x^4+(1/4096)x^2-2/3>0
    x^4+(1/4096)x^2-1/2>0

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