2x-1≥3x-5
    （2y-4）^2+4（y-2）（3y+7）≥0
    （2y-4）^2+4（y-2）×（3y+7）≥0
    18+79x<21+50x
    a^4 - 80*a^3 + 6344721 < 0
    (103702241 + x^4) / (1216969 + x^3) < 80
    100*(n^2)>2*n
    100*n^2>2*n
    100n^2-2^n<0
    2x>6
    x-5/2+1>x-3
    2-4x>3*(3x-1)
    100*n＾2＜2＾n
    x＜8lgx
    1.35*(0.9-X)<0.95
    1.36*(0.9-X)<0.95
    1.35*（0.9-X）>0.95
    X/12000*0.1>X/7000*0.65
    C(8,x)*(-2)^x>=C(8,x-1)*(-2)^(x-1)
    C(8,x)*2^x>=C(8,x-1)*(-2)^(x-1)

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