12x+11≤3
    abs(a-2)
    log(x,2/3)>1
    315.62k-4734.37<1000
    9x^2-16x-8>0
    2^-1>1
    2^a+1<0
    2^a+1>0
    2^a/2^a+1>1/2
    2a/2^2+1>1/2
    2x^2-5x-12≥0
    x*x+4*x-24＞0
    25a+5（2a+8）≥610
    25a+5（2a+8）≤670
    xxx<4
    sin(x)>cos(x)
    x^x>x^2
    x^x>(x-1)^x
    x^x>(x-1)^(x-1)
    x^x>x^(x-1)

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