ln0.444<(4951.5/x－5.103)
    -x+2≤（-4*x+6)/(x^2-4*x+4)
    -x+2≤（-4*x+6)/(x-2)^2
    sinx>0.5
    sinx>0.7
    x∧4-6sinx≤5x
    1/((2^(5x+3))(x+2)(5x+13))<10^-4
    0.5x<1
    (1/4)x<1
    x^5<1
    x＾２-4x+4≥0
    x＾２+x+1＞0
    x＾２+x+1≤0
    2x+5<1
    x＾２-7x-5 ≥ 0
    x2＞x
    3x-1≤3-x
    4x^2-x-5<0
    4x^2-x-5>0
    (x-1)^9/（x+2）>0

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