Mathematics
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    x2-2x-15>0
    2^k-1≤1000
    5x-x×x-6<0
    100*n^2<2^n
    8*n^2<64*n*lgn
    x^2+2x>-2
    (2X+3)/(X-1)<1
    (x+1)(3x-10)≤0
    555555x+777777<444444x+999999
    (x-1)(x-6)≥(x-2)(x-3)
    8x-4x^2-4>x^2-5x+6
    ex+e(-x)>1000/3
    x>300
    x+(1-x^2)^(1/2)>0
    sin (tanx)>tan(sinx)
    12-2x<=7
    0.6(y+21)大于等于13.31
    (x+16)/(24+6)>=0.7
    (x-2)(1-x)(x+2)>0
    (x-1)÷(x+1)>3

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