3*n^2-2n+1<0
    n^2/2^n>（n+1）^2/2^（n+1）
    -x^2-6x+72<45
    log(3,-x^2+72-6x)-log(3,5)<2
    x^2-3x-18≤0
    (2m-2)^2-4(m+2)＞0
    4(m-1)^2-4(m+2)＞0
    x^2+2(e-1)x+(e+2)＞0
    e/x-1＜0
    e/x-1＞0
    4/(x+1)<1
    4/x+1<1
    x²+2x>0
     26700 + W - W * ( 0.1 / 4 ) ≥50000
    26700+W-W*(10%/4)≥50000
    e^(-3.14x/sqrt(1-x^2))<0.05
    sinx≥ √3/2
    -0.03cosx≥sinx+0.06
    1－x+1/(1－x)－3≤0
    x/2>ln(1+x)

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