(2x-7)(2x-7)>=(4x+5)(4x+5)
    (2x-5)(2x-5)>=(4x+7)(4x+7)
    C(100,n)*0.01^n*0.99^(99-n)+0.99^99>1
    -x^2-2x-1小于0
    -1<-2x^3+3x^2<1
    2a-4>0 3-a>0
    30xxxx-100xxx+144x-16>0
    6xxxxx-25xxxx+72xx-16x-49>0
    （a-3/2）＾2>5/4
    a＾2-3a>-2
    a＾2-3a+2>0
    2a-2
    2a-2
    2a-2
    4*x*x-5*x-1>0
    30x-5x^2-25＜0
    30x-35x^2-25＜0
    14x-3x^2-15＜0
    (8/3×tan(x+π/2))^2-4×((tan(x+π/2))^2+1)×(-17/36)＜0
    13

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